Low Voltage Disconnect, Sure Power
Contents
1. 57A 57B 57S and 416 e Refrigerator cooler power circuit 57B Once battery voltage reaches 13 volts or if the ve hicle is started the LVD module will automatically reconnect power to the predetermined circuits The LVD module incorporates a 60 second time de lay to prevent false triggering and is equipped with internal short circuit protection over current protec tion transient voltage suppression and thermal pro tection The LVD module has two terminal post connections a 10 pin connector port and an LED indicator all mounted on the side of the module See Fig 2 n n N n n iy l f Ld Z 2 1 Se _ P oO 24O K A J B H C 3 G D Loo F E E 4 O JVITIWS 06 24 99 7 1542882 1 Low Voltage LED 2 V Out Terminal 3 10 Pin Connector Port 4 V In Terminal Fig 2 Low Voltage Disconnect Module side view The two terminal post connections are V in and V out The V in terminal circuit 447 is the voltage supply input from the circuit breaker relay panel and protects the LVD module by passing through a 50 amp circuit breaker The V out terminal circuit 447H Heavy Duty Trucks Service Manual Supplement 23 December 1999 050 1 54 26 Low Voltage General Information is the controlled voltage output from the LVD module to the ISO bus power input terminal of the circuit breaker relay panel predetermined cab and sleeper circuits It also supplies power to the warning2. buzzer circuit 447J The 10 pin connector contains circuit 447B which is connected to the battery and is used by the LVD module to monitor the level of battery voltage It con tains the module s ground circuit GND also con nected to the battery and it contains the warning buzzer circuit 447G which sounds the warning buzzer when the LVD module detects low voltage Disconnect Sure Power 050 2 Heavy Duty Trucks Service Manual Supplement 23 December 1999 Low Voltage Disconnect Sure Power 04 26 Low Voltage Disconnect Module Removal and Removal 1 Park the vehicle on a level surface Shut down the engine Set the parking brake and chock the tires 2 Disconnect the batteries 3 Open the exterior baggage compartment door on the left hand side aft of the door The low volt age disconnect module is located behind the pro tective plastic cover mounted on the back wall See Fig 1 4 Unfasten the four Torx head fasteners and re move the protective plastic cover Ay CAUTION To prevent damage to the low voltage disconnect module remove the ground wire from the ground terminal last 5 Remove the low voltage disconnect module 5 1 Note the position of the wiring on the ter minals and remove the wiring from the screw terminals on the side of the low voltage disconnect module See Fig 2 5 2 Remove the six mounting fasteners three above and three below the module from the baggage co
3. Low Voltage Disconnect Sure Power General Information The optional low voltage disconnect LVD module is mounted inside the driver s side exterior baggage compartment against the back wall The module is protected by a molded plastic cover See Fig 1 2 x lt x l 1 CS 06 08 99 542886 1 Baggage Compartment Door Opening 2 Low Voltage Disconnect Cover Fig 1 Low Voltage Disconnect Mounting The low voltage disconnect module monitors battery voltage levels If battery voltage falls below 12 3 volts the LVD module will sound a warning buzzer for one minute If no action is taken within that time the LVD module will remove power to predetermined cab and sleeper circuits and an LED indicator on the module will be illuminated The LVD module will turn off power to the following main cab circuits if installed e CB power circuit 2950C e Cigar lighter circuit 5 e Dome reading and map lights circuits 41 108A and 109A Extra dash switches circuit Opt Locating and positioning system circuit 427A Mirror heat and power circuit 80 and 157 e Power windows circuit 363R and 363L e Radio power circuit 295B Road lights circuit 28D 54 26 General Information e Utility lights circuit 73 The LVD module will turn off power to the following sleeper circuits e Baggage compartment lights circuit 113 e Dome and reading lights circuit 41 41J e Power receptacles circuits
4. e Set the parking brake and chock the Connect the batteries and remove the chocks tires from the tires Disconnect the batteries Remove the electrical center cover See Fig 1 3 2 A 4 5 DN 04 11 96 f600593a 1 Drivers Instrument Panel 3 Glove Compartment 5 Electrical Center Cover 2 Center Dash Panel 4 Heater A C Cover Fig 1 Dash Panel 4 Remove from the circuit breaker relay panel the two mounting fasteners that hold the low voltage disconnect warning buzzer and remove the buzzer The buzzer can be mounted anywhere on the panel See Fig 2 5 Remove the electrical connector from the low voltage disconnect warning buzzer Installation 1 Attach the electrical connector to the low voltage disconnect warning buzzer 2 Install the warning buzzer in the space available on the circuit breaker relay panel using two stan Heavy Duty Trucks Service Manual Supplement 23 December 1999 110 1 54 26 Low Voltage Disconnect Sure Power Low Voltage Disconnect Warning Buzzer Removal and Installation 06 15 99 L i L L L SS 1 Junction Block 2 Bosch Relays 3 Bus Bar 542885 4 50 Amp Circuit Breaker 5 Low Voltage Disconnect Warning Buzzer 6 Circuit Breaker Panel Fig 2 Circuit Breaker Relay Panel 110 2 Heavy Duty Trucks Service Manual Supplement 23 December 1999
5. mpartment backwall and remove the low voltage disconnect mod ule Installation Installation 2 Attach the protective plastic cover to the back wall with four Torx head fasteners 3 Close the baggage compartment door Connect the batteries 5 Remove the chocks from the tires 06 08 99 1542886 1 Baggage Compartment Door Opening 2 Low Voltage Disconnect Cover Fig 1 Low Voltage Disconnect Mounting 1 Install the low voltage disconnect module inside the left hand exterior baggage compartment against the backwall 1 1 Place the module against the backwall and install the six Torx head fasteners Tighten them firmly A CAUTION To prevent damage to the low voltage disconnect module connect the ground wire to the ground terminal first 1 2 Install the wiring to the terminals on the top of the low voltage disconnect module See Fig 2 wo OIA mooOwPr 06 24 99 542882 Low Voltage LED V Out Terminal 10 Pin Connector Port V In Terminal PON gt Fig 2 Low Voltage Disconnect Module side view Heavy Duty Trucks Service Manual Supplement 23 December 1999 100 1 Low Voltage Disconnect Sure Power 54 26 Low Voltage Disconnect Warning Buzzer Removal and Installation Removal dard hardware fasteners See Fig 2 Tighten the fasteners firmly 1 Park the vehicle on a level surface Shut down 3 Attach the electrical center cover See Fig 1 the engin
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