R/V Fuse Block; G-Van Cab Harness Routings - GMC G Service Manual

8A-16 CAB ELECTRICAL

R/V FUSE BLOCK

The fuse block holds the fuses and circuit breakers that
protect the circuits. The fuse block is located on the left side
of the dash panel and is fastened to the dash panel connec­
tor block with two screws. The fuse panel connects to the
engine compartment harness. Power leads from the var­
ious circuits plug into the fuse block.
The fuses are encased in plastic and have twin blade
connectors. The fuses are printed and color coded with the
amperage rating. Refer to Figure 20.
I I 1
I I 11 □ E3 0
woo
□
e
I I (3
B A T T IQ N
a
[ 20A I
K ]
L_j— i_J
H O R N /O M IO N A U X H T R A /C
pO/TJ p5A^
fM ]
TAIL/CTSY
GAGE/IDLE
JOA
T U R N B /U
EC M I*
C R A N K *
*Not on Diesel Engine equipped vehicles.
Figure 20 — R/V Fuse Block

G-VAN CAB HARNESS ROUTINGS

INSTRUMENT PANEL HARNESS (Figure 21)
The instrument panel harness in the G-Van includes the
circuits for the instrument panel gages, indicators, main
light switch, windshield wiper and washer, and the steering
column controls. The harness is held in place with clips that
plug into brackets which are mounted on the instrument
panel.
FRONT DOOR POWER LOCK SYSTEM (Figures 22
and 23)
This harness starts from the fuse block, which is located
under the far left side of the instrument panel. The left
branch of the harness has a connector at the left door hinge
frame. Then the harness passes into the frame and routes
down to a flexible conduit to the door. Inside the door, the
harness branches; one branch going down to the door lock
motor, and the other branch going up to the door lock
switch.
0
0 (p]A "* H E A T
0
A /C
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A C C L P S P W R
30
C IR /B R K
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---- 1 _ L — _
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3 T O P - H A Z
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L00243
The right branch of the harness routes across the top of
the instrument panel to the right door hinge frame. The
harness passes through a connector and continues into the
door frame. The harness routes down to a flexible conduit
and then passes through the flexible conduit into the door.
Inside the door, the harness branches; one branch going up
to the door lock switch, and the other branch going to the
door lock.
SIDE DOOR POWER LOCK CIRCUIT (Figure 24)
The side door power lock circuit branches off from the
left roof halo harness just behind the front door latch frame.
It goes across the roof frame and down the right front door
latch ,:rame, where it connects to the door frame contact
assembly. The door frame contact assembly aligns with the
door contact assembly so that electrical contact is made
when the door is closed. In this way, electricity is conducted
to the side door power lock motor.
REAR DOOR POWER LOCK CIRCUIT (Figure 25)
The rear power door lock harness is routed from the
connector on the left front door hinge frame. The harness
goes up the frame to the roof, rearward along the roof halo
panel and then crosses over to the right rear corner, using
the rear roof halo panel. The harness goes down the right
rear corner to a connector just below the upper door hinge.
The harness then passes through grommets and into the
right rear door. Inside the door the harness connects to the
power lock motor.
POWER WINDOW SYSTEM (Figures 22, 23, 24 and 25)
This harness starts at the fuse block and routes to the
left and right along the instrument panel. The harness then
routes into the left and right front doors. At the left door
hinge pillar, the harness routes up to the left roof halo
panel, back to the first roof frame, branches to the right side
of the van and rearward to the rear door. The branch that
went to the right side routed down the side door hinge pillar
and into the side door.
INTERIOR LIGHTING SYSTEM (Figures 26 and 27)
This circuit starts at the fuse block and routes to the body
harness connector. The standard harness is then routed up
the left front door hinge frame and back along the left roof
halo panel. The harness branches at the first and third roof
frames, with connectors located next to the left roof halo
panel. The harnesses then go to the roof lamps and termi­
nate in bulb clips. The standard harness also branches off
to the door switches.
The optional harness is routed from the body harness
connector to a control switch on the instrument panel. The
harness then goes from the switch to the left front door
hinge frame, up the frame, and back along the left roof halo
panel.
When the harness reaches the first roof frame, it goes
into a connector. There are two branches coming out of the
connector. One branch goes to the center lamp assembly in
the roof. This branch, after connecting to the center lamp
assembly, continues on to the right side of the roof, where it
goes into a connector. From this connector, one lead goes
to the side door grounding switch. The other leads are
routed down the right front door lock frame to the stepwell
lamp assembly.