MSD Pulse Ignition for Harley-Davidson®
Contents
1. MSD Pulse Ignition for Harley Davidson PN 42211 IMPORTANT Read these instructions before attempting the installation It is also recommended to have your bike s Service Manual available during the installation Parts Included In This Kit Parts Not Included In This Kit 1 MSD Pulse Ignition PN 42211 1 Mounting Kit PN 4393 1 1 Ignition Coil Pack PN 43952 PN 43931 1 2 PN 43932 1 5 2 Super Conductor Spark Plug Wires 1 Distributor Kit PN 32019 1 MSD MC Ignition Tester PN 43751 1 Trigger Pickup amp Rotor Assembly PN 42315 WARNING During installation disconnect the battery cables When disconnecting the battery always remove the negative cable first and install it last Note The optional MSD Pulse breakerless distributor must be installed on Panhead Knucklehead or early model Shovelhead V Twins equipped with a distributor PREPARING FOR INSTALLATION Take the engine out of gear and rotate the engine until the front cylinder timing cylinder is positioned at top dead center on the compression firing cycle Do not rotate the engine again until the installation of the MSD is complete MOUNTING The original ignition module may be removed or left in place If it is left on the bike disconnect all of the connections to avoid interference with the MSD Pulse The MSD Pulse Ignition can be mounted in any position as long as it is kept away from direct engine heat sources MSD offers three2. BTDC The default is 30 BTDC The timing ramps from 500 rpm at 5 BTDC to max timing value Figure 9 e REES MIN TIMING e e e l l l l l l l l l Uce Loe ee l l l 2 000 3 000 4 000 5 000 6 000 RPM 1 000 No Figure 9 Max Timing RPM MAX TIMING RPM Selectors S5 S7 of Switch 1 control the engine rom when the timing is at the max value programmed by the Max Timing selector switch There are eight selectable advance curves for advancing the ignition timing from 500 rom to 1 750 rom rapid advance or 500 rpm to 3 500 rpm for a milder advance curve The default is 2 000 rom TWO STEP REV LIMIT Selectors S3 S5 of Switch 2 control the Two Step rev limit or staging rom There are eight selectable staging rev limit rom values from 3 000 rpm to 4 750 rom The default is 3 500 rom The Two Step rev limit overrides the Max Rev limit when its Light Blue control wire is grounded MAX REV LIMIT The Maximum Rev Limit is controlled by S6 S8 of Switch 2 The rpm limit is adjusted in 250 rom increments between 6 250 rom and 8 000 rpm The default is set at 6 250 rpm Note It is not recommended to raise the limit above 6 250 rom unless the valvetrain has been altered to increase the safe rpm limit of the engine VOES MAX TIMING The VOES timing is variable from 500 rpm up to the programmed VOES max rpm value selected on S8 of
3. completely through the port It must be positioned to protect the wires as they pass through the port opening 2 Mount the MSD pickup plate inside the housing Figure 1 Note the adjusting notch on the edge of the plate This notch must be located over the series of steps inside the housing about the 7 o clock position as you face the housing One of the sensor units will be at approximately 12 o clock SPORTSTER MODELS 1 On Sportsters the wire access port must be enlarged Use a 9 32 drill bit to enlarge the wire port 2 Remove the wire harness clamp of the pickup assembly and route the wires through the port 3 Mount the MSD pickup plate inside the housing Figure 2 Note the adjusting notch on the edge of the plate This notch must be located over the cast notch inside the housing about the 11 o clock position as you face the housing The shorter of the two sensors will be approximately in the 9 o clock position 4 Install the hold down standoff screws with flat washers until they are snug do not tighten at this time Figure 3 3 Put the MSD rotor in place on the end of the camshaft The locating pin in the rotor bore must align with the groove in the cam Do not force the rotor on the camshaft Push the rotor into place until itis tightly against the end of the cam then snug the retaining screw 4 Check the distance from the outer surface of the pickup plate to the end of the installed rot
4. is exclusive and in lieu of all other warranties or representations whether expressed or implied including any implied warranty of merchantability or fitness In no event shall MSD Powersports or its suppliers be liable for special or consequential damages Intended normal use means that this item is being used as was originally intended and for the original application as sold by MSD Powersports Any modifications to this item or if it is used on an application other than what MSD Powersports markets the product the warranty will be void It is the sole responsibility of the customer to determine that this item will work for the application they are intending MSD Powersports will accept no liability for custom applications MSD POWERSPORTS 1490 HENRY BRENNAN DR EL PASO TEXAS 79936 915 858 3365 FAX 915 858 3496 FRM26942 Revised 07 05 Printed In U S A
5. recommended that the setting is incremented in only two degree steps followed by thorough testing In some cases the engine may respond to more timing at lower engine speeds and less timing on the upper ranges In this instance the total timing can be increased for better low end response and the VOES intercept can be defined higher in the range to reduce the timing in the upper rom ranges during wide open throttle acceleration When VOES is enabled WOT the max timing at high speed is 3 less than the max timing value MSD POWERSPORTS 1490 HENRY BRENNAN DR EL PASO TEXAS 79936 915 858 3365 FAX 915 858 3496 10 INSTALLATION INSTRUCTIONS ENGINES WITHOUT VOES The ignition timing is only controlled by the Max Timing value and the Max Timing RPM values to set the advance curve and maximum timing If detonation at lower speeds under hard acceleration occurs use a higher Max Timing RPM Then proceed to set the Max Timing value for high speed operation TROUBLESHOOTING INOPERATIVE TACHOMETER The MSD Pulse delivers a conventional 12 13 volt square wave signal that is compatible with most factory tachometers Some aftermarket tachometers require a high voltage spike If the tachometer does not operate properly an MSD PN 8920 Tach Adaptor should be used to provide a suitable signal CHECK WIRING e Check wiring routing and connections e Make sure all of the terminals and pins are crimped tightly and are fully seated in the conn
6. the cover screws do not protrude into the pickups Also remove the clear plug from the timing view port and install the conventional plug 8 If it is desirable to run different timing on the rear cylinder vs front first set the timing on rear by adjusting the pickup Then loosen the pickup screws of the front pickup and move it until the desired timing is achieved TUNING AND TESTING Road or track testing is the most realistic method to verify the timing program Note If the timing is advanced excessively detonation may occur which could result in engine damage For best and the most accurate performance tests e The engine should be warmed to normal operating temperature e Shift into high gear and snap the throttle to the wide open stop e Listen carefully for any pinging or knocking sounds These are characteristics of detonation which indicate too much advance VOES EQUIPPED ENGINES If there are no indications of detonation during testing the VOES curve can be defined to a lower rom setting This should increase engine response during mid range throttle up Reduce the curve in 250 rpm increments Testing must be performed after each change to verify that there are no signs of detonation If the VOES curve is reduced to the lowest point 3 500 rom and signs of detonation are not present the total timing can be increased above the suggested default value 36 BT 30 Sportster When timing exceeds 36 it is highly
7. the rotor installation e Check the operation of the Ignition using the following test CHECKING FOR SPARK Note MSD PN 43751 MC Ignition Tester is available for complete ignition testing This test false triggers each channel of the ignition so the operation of the Ignition or pickup s can be determined Set the selector S1 of Switch 1 to On for the kick start position 1 With the ignition Off remove both spark plugs Re attach the plug wires and position the threaded section of each spark plug to the engine case ground 2 Disconnect the trigger harness of the MSD amplifier from the pickup plate harness MSD POWERSPORTS 1490 HENRY BRENNAN DR EL PASO TEXAS 79936 915 858 3365 FAX 915 858 3496 INSTALLATION INSTRUCTIONS 11 3 Using a jumper wire a straightened paper clip works well link the terminal of the black wire in the MSD connector to the terminal of the white wire in the pickup connector 4 Attach a similar jumper wire to the terminal of the Blue wire in the pickup connector and join it to the first paper clip 5 Turn the ignition switch On and separate the jumpers A spark should jump from one of the spark plugs 6 Turn the ignition switch Off and reverse the connection Link the terminal of Black wire in MSD connector to the terminal of the Blue wire in the pickup connector Attach the second jumper to the terminal of the White wire in the pickup connector 7 Turn the ignition switch On and separate the j
8. 1490 HENRY BRENNAN DR EL PASO TEXAS 79936 915 858 3365 FAX 915 858 3496 6 INSTALLATION INSTRUCTIONS PROGRAMMING THE PN 42211 PULSE IGNITION Note The factory program settings are suitable for most Harley Davidson V Twins Program changes may be made for special requirements MAX TIMING 26 40 DEGREES MAX REV LIMIT RPM IS 6 250 TO 8 000 RPM IN 250 RPM INCREMENTS STAGING REV LIMIT IS 3 000 TO 4 750 RPM IN 250 RPM INCREMENTS NOTE VOES MAX TIMING IS 3 200 RPM DEGREES LESS THAN MAX TIMING VALUE WHEN VOES IS OPEN WOT Leo t t t L _ _ o000 000 000 000 000 000 000 000 RPM 1 2 3 4 5 6 7 8 Figure 7 Timing Curve OPERATION The MSD Pulse produces the computer generated timing curve shown in Figure 7 Several programming options are available to tune the ignition to your application There are two switch assemblies behind the aluminum base plate on the back of the MSD unit where programming changes are made Figure 8 The MSD Pulse is programmed at the factory for operation on most engines It is recommended to install and run the MSD before making any adjustments Figure 8 shows the factory settings Sportster timing will typically be 30 or less Big Twin 36 or less max timing BTDC VOES MAX TIMING RPM STAGING REV LIMIT 1750 OFF OFF OFF 6250 OFF OF
9. F OFF 2000 ON ae OFF OU 3050 ON OFF 6500 ON OFF OFF 36 OFF ON OFF 2250 OFF ON OFF BEO Mesa OIG Mei A Mey a 34 ON ON OFF f 2500 ON ON OFF f 4250 ON ON OFF f 3750 ON ON OFF Bn 4500 OFF OFF ON int Lore Lore on 7250_ OFF OFF ON O ON Ole OK 3000 ON OFF ON J 4750 ON OFF ON f 4250 ON OFF ON f 7500 ON OFF ON 3250 J OFF ON ON 4500 OFF ON oN E 7750 OFF ON ON 26 ON ON ON f 3500 ON ON ON 4750 ON ON ON J 8000 ON ON ON Kick Start ON PN 42211 max VOES SHE a 1 MAX TIMING SET FOR 30 DEGREES lt May TIMING THING 2 MAX TIMING RPM 2 000 RPM a TIMING APM RPM int thar 3 VOES MAX TIMING 4 000 RPM 4 TWO STEP REV LIMIT 3 500 RPM JORG BRGED ANHEE ARORGUUR ARGAHHHH 5 MAX SPEED REV LIMIT 6 250 RPM Figure 8 Programming Switches and Factory Settings ELECTRIC OR KICK START Selector S1 of Switch 1 defines the ignition for Electric Start Off postion or Kick Start On position When in the Off position the engine will rotate 2 3 revolutions before the ignition outputs any sparks to allow less loading or kickback on the starter motor MSD POWERSPORTS 1490 HENRY BRENNAN DR EL PASO TEXAS 79936 915 858 3365 FAX 915 858 3496 INSTALLATION INSTRUCTIONS 7 MAX TIMING BTDC Selectors S2 S4 of Switch 1 control the Maximum Timing There are eight selectable Max Timing values available from 26 to 40
10. To obtain an RMA number please contact MSD Customer Service at 915 855 7123 or fax a request to 915 857 3344 Send the unit prepaid with proof of purchase to the attention of MSD Powersports Customer Service RMA 12120 Esther Lama Dock 5 El Paso Texas 79936 When returning the unit for repair leave all wires at the length in which you have them installed Be sure to include a detailed account of any problems experienced and what components and accessories are installed on the vehicle The repaired unit will be returned as soon as possible after receipt COD Cashiers Check for any charges For more information call the MSD Powersports Customer Service Line 915 858 3365 MSD Powersports technicians are available from 8 00 a m to 5 00 p m Monday Friday Mountain Time Limited Warranty MSD Powersports warrants this product to be free from defects in material and workmanship under its intended normal use and if properly installed for a period of one year from the date of original purchase If found to be defective as mentioned above it will be repaired or replaced at the option of MSD Powersports Any item that is covered under this warranty will be returned free of charge through standard shipping methods If faster service is required the customer has the option of paying for this service This shall constitute the sole remedy of the purchaser and the sole liability of MSD Powersports To the extent permitted by law the foregoing
11. ace and requires a hook like tool between the edge of the plug and the body of the plug Note It is possible to make a suitable tool from a ten penny nail Grind or file the head of the nail away until there is about a 0 100 inch wide hook left then bend the tip over 90 Figure 11 3 Turn the hook under the edge of the plug and pull it free Push the gray tab and pull the pins out of the sockets in the back of the connector 4 Carefully swap both pins of each coil circuit to the corresponding positions of the other coil Be certain to maintain the wire pairings Black to Brown and Orange to Orange Green 5 Re assemble the connector with the swapped wiring and check for spark e If the same plug fails during each test the coil is at fault and requires replacement Figure11 Custom Wire Removal Tool e If the opposite plug fails during the test the ignition or pickup is at fault GRIND HEAD MSD POWERSPORTS 1490 HENRY BRENNAN DR EL PASO TEXAS 79936 915 858 3365 FAX 915 858 3496 TECH NOTES Service In case of malfunction this component will be repaired free of charge according to the terms of the warranty When returning components for service Proof of Purchase must be supplied for warranty verification After the warranty period has expired repair service is charged based on a minimum and maximum charge All returns must have a Return Material Authorization RMA number issued to them before being returned
12. ectors e Confirm all of the connections with the wiring diagram in the installation instructions e If any wires or connections have been modified or shortened use an ohm meter to confirm continuity through the connectors CHECK THE BATTERY e Verify the Red wire of the MSD is firmly connected to the positive battery terminal e Verify the Black wire is firmly connected to the negative battery terminal Battery Condition Connect a volt ohm meter across the battery to check battery voltage If the meter indicates less than 10 volts static non cranking ignition switch On or less than 7 volts while cranking the engine with the starter the MSD Pulse will not operate properly Ignition Supply Check for a 12 volt input to the MSD Module With the ignition switch On use a volt ohm meter to verify that at least 10 volts is supplied to the MSD Violet wire If less than 10 volts is supplied the MSD Pulse will not operate properly SYSTEM FUNCTION CHECKS If the system meets all the above criteria but will not start the difficulty may be in one of the three areas the pickup assembly the coils or the ignition module The following procedures may be used to identify a possible difficulty Pickup Test Turn ignition switch On and crank the engine The LED should blink which means that it is receiving a trigger signal and that the problem is in the amplifier or coil section e Inspect the pickup harness for proper connections e Inspect
13. mpletely lock the plate until the total timing is set Note Do not replace the cam ignition housing cover plate until total timing has been set MSD POWERSPORTS 1490 HENRY BRENNAN DR EL PASO TEXAS 79936 915 858 3365 FAX 915 858 3496 INSTALLATION INSTRUCTIONS 9 CHECKING TOTAL TIMING Note It is recommended that total timing not exceed 36 BTDC for Big Twins or 30 for Sportsters 1 Install a clear sight plug Harley Davidson part number HD 96295 65D in the timing port 2 Connect a timing light to the front cylinder s plug wire Note It is important to have a high quality timing light such as the MSD PN 8990 to ensure correct timing signals 3 Start the engine If the engine does not start within a few seconds review and verify the installation wiring and programming procedures 4 Once the engine has started increase the engine speed until the rom exceeds 2 000 rpm and check the timing Verify that the maximum timing matches the switch programmed value default 30 for Sportsters change to 36 for Big Twins Adjust the timing to Advance rotate the pickup plate clockwise To retard the timing rotate the plate counterclockwise 5 Repeat the procedure until the timing index is centered in the port when engine speed is above 2 000 rpm This is 35 mark on Big Twins and 30 for Sportsters 6 Shut the engine off and tighten the pickup plate screws 7 Replace the cam ignition housing cover plate Be certain
14. or Figure 4 If necessary add shims until the measured rotor height is 9 16 1 32 5 When the rotor height has been verified Figure 2 Pickup Position for Sportsters remove the retaining screw place a drop of Red Loctite on the threads and re install the screw to the factory recommended torque Figure Installing the MSD Pickup Assembly Note On Sportsters ensure that the loose pickup wires are clear of the rotor Apply a small bead of silicone to the wires to secure them MSD POWERSPORTS 1490 HENRY BRENNAN DR EL PASO TEXAS 79936 915 858 3365 FAX 915 858 3496 INSTALLATION INSTRUCTIONS 3 NOTES 2 8 WASHERS AND 1 2 00 CAP SCREW SUPPLIED WITH THIS PICKUP ASSEMBLY CAM HOUSING awe APPLY A SMALL DROP OF LOCTITE ON THE TIP OF THE 2 00 SCREW BEFORE FINAL INSTALLATION COVER SCREW LENGTH SHOULD BE LONG ENOUGH TO ENGAGE INSIDE COVER BUT NOT PROTRUDE THROUGH TO PICKUPS 8 WASHER 2 ON COVERS PICKUP ASSEMBLY SCREW 2 THREADED SPACER 2 2 00 CAP SCREW SCREW 2 TOP OF PLATE IA Y N YX N N O NN RS QQ KX A KN N A N Wi A QQ QQ QS YS SS Figure 4 Checking the Rotor Height Note If shims are used make sure the rotor runs true The shims may ride on the cam shoulder radius if not properly installed 6 The epoxy covered magnet in the outer edge of the rotor sh
15. ould align just to the left of the slight bulge on the inner surface of the upper pickup If the alignment is not correct the engine may have been rotated from top dead center or the pickup plate is improperly installed Verify this alignment before proceeding The housing cover should not be reinstalled until the timing procedures are completed Before making any connections check the following Verify that all wire harnesses are routed away from exhaust heat and sharp edges e Ensure at least one inch separation between the coil harness and the pickup harness to reduce electrical interference Leave some slack in the wire harnesses to accommodate engine and road vibration It is not recommended to extend or shorten the coil or pickup harnesses WARNING Do not connect the negative battery wire until the entire installation is complete MSD POWERSPORTS 1490 HENRY BRENNAN DR EL PASO TEXAS 79936 915 858 3365 FAX 915 858 3496 INSTALLATION INSTRUCTIONS DUAL PICKUP ROTOR l ACTIVATED 1L LIGHT BLUE WHEN SWITCHED l r 2 STEP ENGINE RED RN aly IGNITION lies SWITCH Darien Naa TACHOMETER oy Onn ORS L Ll IGNITION CIRCUIT pA O Bae BREAKER e Figure 5 Wiring the MSD Pulse Ignition BLACK VIOLET LIGHT BLUE TACH TERMINAL COIL This is the longer 4 wire harness with two wires tagged Front Cyl for the HARNESS front cylinder and the other two marked Rear Cyl PICKUP This is the short 4 wi
16. re harness that connects to the MSD pickup assembly a eR TS RE MSD POWERSPORTS 1490 HENRY BRENNAN DR EL PASO TEXAS 79936 915 858 3365 FAX 915 858 3496 INSTALLATION INSTRUCTIONS 5 ASSEMBLE THE PICKUP HARNESS 1 2 3 Insert the orange locking plug through the open end of the connector Use a screwdriver to TACHOMETER OR SHIFT LIGHT There are two suggested methods to connect a tachometer or shift light to the MSD e The free length of Green wire may be used to connect the e A single wire connected to the coil generally pink usually Connect the pickup harness to the amplifier pickup harness p Plug the female connector housing without the wires installed to the male connector on the main pickup harness Note the location of the color coded wires in the pickup pigtail to the corresponding wires of the male connector Remove the connector housing Insert the pre crimped wire terminals into the female connector push the plug into the shell until it locks Figure 6 Once assembled pull on each wire to ensure it is locked in position and verify that the color codes of the wires are connected properly MSD tach terminal directly to the tachometer or shift light input VTI EEAS provides the input signal to the factory tachometer The Green wire and connectors can be used to join the MSD terminal to the free end of the existing tach wire Figure 6 Assembling the Connector MSD POWERSPORTS
17. re of the MSD and a wire of the VOES Switch to one terminal of the Switch The other terminal of the switch goes to ground e When the switch is OPEN the VOES curve is enabled via the VOES Switch This is suited for less aggressive operation and highway cruising e When the switch is closed connected to ground the VOES curve is disabled This configuration reverts to the basic advance program providing full advance at all engine speeds in excess of the programmed max timing rom value 1 750 to 3 500 rpm SWITCH MSD PN 8807 TO GROUND VOES SWITCH Figure 10 Connecting a VOES Switch TIMING THE ENGINE The ignition timing should be set and checked at start up static and total high rpm CHECKING STATIC TIMING 1 Verify that the top dead center index for timing cylinder front is still centered in the timing port If the TDC index is not in view rotate the engine until the front cylinder is on the compression firing stroke and the TDC index is centered in the timing port 2 Attach the black wire of the MSD control harness to the negative terminal of the battery and turn the ignition switch On Observe the Pulse Monitor LED If the LED is On Rotate the pickup plate clockwise slowly until the LED just turns off If the LED is Off Rotate the pickup plate counterclockwise until the LED turns on Then rotate the pickup plate clockwise slowly until the LED just turns off 3 Tighten the standoff holddown screws do not co
18. switch 1 and S1 S2 of switch 2 The minimum VOES rpm is 3 500 and the maximum is 5 250 With the VOES open at WOT the VOES is activated and will ramp the timing from 500 rom to 3 less than the programmed max timing value at the VOES max timimng rpm programmed value The VOES default is 4 000 rpm This feature is available only when the MSD White wire is connected to a functional VOES manifold switch MSD POWERSPORTS 1490 HENRY BRENNAN DR EL PASO TEXAS 79936 915 858 3365 FAX 915 858 3496 8 INSTALLATION INSTRUCTIONS The basic advance curve is always provided by the MSD Pulse except when the VOES detects low vacuum conditions in the manifold A low vacuum signal causes the micro processor to ramp to the VOES curve over 1 2 second When the VOES turns off the timing ramps to the max timing in one second Note Figure 7 on page 6 shows an example of the basic advance curve with a 4 000 rom VOES curve STATIC TIMING WITH THE LED When static timing the engine the primary output to the coil is disabled and the built in LED indicator is activated In effect this function discontinues all spark delivery and substitutes a visual cue It is best to disconnect the coil connector while static timing the engine After the static timing set reconnect the coil connector VOES CONTROL SWITCH An auxiliary SPDT Switch not included in the MSD Pulse kit may be used to easily turn the VOES Curve on or off Figure 10 Connect the White wi
19. umpers A spark should jump from the other spark plug e If both the plugs fired the MSD and the Coils are working properly and the corresponding pickup s is probably at fault e If one or both plugs did not fire check the operation of the Coils COIL TEST If the ignition is receiving a trigger signal from the pickups but failed the spark test on one or both cylinders the resistance of the coils should be checked 1 Disconnect the negative battery cable 2 Disconnect the coil connector harness 3 To check the primary resistance Connect the ohm meter to the two terminals of the Front Coil Get a reading and then connect the meter to the terminals of the Rear coil The primary resistance should be less than 0 5 ohm 4 To check the secondary resistance Remove the plug wires from the coils and connect the ohm meter to the plug wire terminal and the corresponding primary coil terminal at the 4 pin connector The resistance should be between 1 5K 2K ohms 5 If the coil s is out of specification swap it with a known good coil and test for spark again If only one could fail follow the proceeding procedure lf an ohm meter is not available and only one of the plugs sparked in the original coil 1 Turn the ignition switch off and disconnect the coil harness of the MSD amplifier from the coil pack harness 2 Remove the orange lock plug from the open end of the connector on the coil pack harness This plug is firmly locked in pl
20. unique flex mount kits that are available for different diameter down tubes PN 4393 1 1 1 16 PN 43931 1 1 2 1 9 32 and PN 48932 1 7 16 1 17 82 If you are going to make a custom mount remember to e Make it easy to access the programming switches e Select a location that will not interfere with airflow to the front cylinder e Ensure the location allows for the upward rearward movement of the fender wheel as the fork compresses and does not interfere with steering clearance MOUNTING COILS Remove the existing coil assembly and then install the MSD dual coil pack bracket to the frame using the existing fasteners Note On some applications such as the Sportster the MSD coil mount may require modification to clear the gas tank Never modify the black coil assemblies Harley Davidson is a Registered Trademark of Harley Davidson Motor Company MSD POWERSPORTS 1490 HENRY BRENNAN DR EL PASO TEXAS 79936 915 858 3365 FAX 915 858 3496 INSTALLATION INSTRUCTIONS PICKUP PLATE INSTALLATION Remove the existing trigger points plate and rotor points cam and advance Refer to the bike s Service Manual for the proper procedure EVOLUTION AND LATE MODEL SHOVELHEAD V TWINS 1 From inside the cam ignition housing feed the free end of the MSD pickup harness through the wire access port Note The harness includes a heat resistant acrylic sleeve that fits snugly inside the port opening Do not pull the sleeve
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