Dodge RAM TRUCK 1500 1995 Service Manual page 692

B R
8W-51 REAR LIGHTING
8W - 51 - 1
REAR LIGHTING
TAIL LAMPS AND REAR LICENSE PLATE LAMPS
Circuit A7 in the Power Distribution Center (PDC)
connects to a bus bar in the fuse block. One of the
four circuits powered by the bus bar is circuit F33.
Circuit F33 connects to the headlamp switch. Fuse 1
in the PDC protects the A7 circuit. Fuse 18, a 15
amp, in the fuse block protects circuit F33.
The headlamp switch has three positions: OFF,
PARK (parking lamps) and ON, plus a dimmer
switch. When the headlamp switch is in the PARK or
ON position, the switch connects circuit F33 to cir­
cuit L7. From the headlamp switch, circuit L7
branches to power the front parking lamps and rear
tail lamps, roof clearance and identification lamps,
fender lamps and rear license plate lamps.
GROUND CIRCUIT
Circuit Z13 provides ground for the lamps.
HELPFUL INFORMATION
• If the vehicle is equipped with factory installed fog
lamps, circuit L7 splices to feed the fog lamp #1 relay
• If the vehicle is equipped with factory installed
trailer tow, circuit L7 splices to the trailer tow har­
ness
• Check fuse 1, a 40 amp, in the PDC
• Check fuse 18, a 15 amp, in the fuse block
• Circuit L7 also feeds the radio, if equipped
• When the headlamp switch is in the PARK or ON
position, the dimmer circuit, F33, also connects to
circuit El. Circuit E l feeds circuit E2, which powers
the ash receiver lamp, instrument cluster illumina­
tion lamps, under hood lamp, glove box lamp and ra­
dio lamp. Fuse 13 in the fuse block protects circuits
El and E2
STOP LAMPS AND CHMSL LAMPS
Circuit A3 from fuse 6, a 40 amp, in the Power Dis­
tribution Center (PDC) supplies voltage to circuit
F32 through fuse 20, a 15 amp, in the fuse block.
Circuit F32 connects to the stop lamp switch.
When the operator presses the brake pedal, the
stop lamp switch CLOSES and connects circuit F32
to circuit L50. Circuit L50 connects to the Center
High Mounted Stop Lamps (CHMSL) and multi-func­
tion switch. The multi-function switch supplies power
to the L62 and L63 circuits. Circuit L62 powers the
right stop lamp. Circuit L63 powers the left stop
lamp.
GROUND CIRCUIT
Circuit Z13 provides a ground for the stop lamps
and back-up lamps. The Z13 circuit has more than
one branch. Circuit Z13 also supplies ground path for
the tail lamps, parking lamps, rear license plate
lamp, back-up lamps, and turn signals. Circuit Z3
provides ground for the CHMSL lamps.
HELPFUL INFORMATION
• Check for blown fuse in circuit F32.
• Check for continuity across the stop lamp switch
when it is CLOSED.
• If the vehicle is equipped with Rear Wheel Anti-
Lock (RWAL) brakes, circuit F32 connects to the
RWAL module.
BACK-UP LAMPS
In the RUN position, the ignition switch connects
circuit A2 from fuse 2 in the Power Distribution Cen­
ter (PDC) to circuit A22. Circuit A22 feeds a bus bar
in the fuse block that powers circuit LIO through
fuse 15.
Circuit LIO supplies power to the back-up lamp
switch. On automatic transmission equipped vehicles,
the back-up lamp switch is part of an assembly that
includes the PARK/NEUTRAL position switch.
When the operator puts the transmission in RE­
VERSE, the back-up lamp switch connects circuit
LIO to circuit LI. Circuit LI feeds the back-up lamps.
GROUND-CIRCUIT
Circuit Z13 provides ground for the back-up lamps.
Circuit Z13 also supplies a ground path for the tail
lamps, parking lamps, rear license plate lamp, stop
lamps, and turn signals.
HELPFUL INFORMATION
• Check for blown fuses in circuits A2 and LIO
• Check for continuity across the back-up lamp
switch when it is CLOSED
• Circuit LI also connects to the day/night mirror
DIAGRAM INDEX
Component _ __Pag[e
Back-Up Lamp Switch 8W-51-4
Back-Up Lamps 8W-51-5
CHMSL 8W-51-7
Fender Lamps .8W-51-8
Fuse Block 8W-51-2, 4, 6, 8
Headlamp Switch .8W-51-2, 8
Ignition Switch .8W-51-4
License Lamps . .8W-51-2, 8
Park/Neutral Position Switch 8W-51-4
PDC Fuses 8W-51-2, 4, 6, 8
RWAL Control Module .8W-51-6
Stop Lamp Switch . .8W-51-6
Tail/Stop/Turn Signal Lamps 8W-51-3
Tailgate Lamps . .8W-51-8