Group 30 Electrical System—VNL, VNM
Design and Function
Electrical Pass-Through for Cab Wiring, Power and Ground
W3000827
A Pass-through for main cab wiring
Main Cab Electrical Pass-Through and Ground
Studs (driver side engine compartment)
W3000591
A Pass-through for chassis wiring to cab
Cab Electrical Pass-Through and Ground Studs
(passenger side engine compartment)
The two main cab cable pass-throughs are on the left
and right sides of the bulkhead. The pass-throughs con-
tain connectors which join the inner and outer cable har-
nesses. The passenger side pass-through contains wiring
for chassis mounted components. The driver’s side pass-
through contains wiring for components mounted under
the hood.
Both pass-throughs consist of a protective outer housing
and an attachment plate which holds the connectors in
position. The pass-through covers can be opened from
the outside.
The cab main power studs are located at the left-hand
side pass-through. Ground studs are located on the left
and right side bulkhead, on both the inside and outside.
Each stud has a unique identity number which is used for
reference in the vehicle electrical schematics. Torques for
the power studs are 10 ±1.5 Nm (7.4 ±1.1 ft-lb) for the
ground studs, and 10 ±2 Nm (7.4 ±1.5 ft-lb) for the main
power studs. The cab main ground stud 1 is located on
the driver’s side, at ground stud 7. The cab main ground
stud is wired directly to the engine ground by a 4 gauge
cable, and is the ground path for all of the cab grounds.
W3000593
Ground Studs (inside cab, driver side)
W3000592
Ground Studs (inside cab, passenger side, under
heater unit)
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