Peterbilt 325 2017, Operator'S Manual

Page: 166 / 392

OPERATING THE BRAKE SYSTEM
these tractors will require greater
brake pedal application to provide the
equivalent braking to a bobtail tractor
not equipped with a proportioning
system. Trailer ABS
Power Line Communication (PLC)
North American on-highway vehicles
are equipped with a separate electrical
circuit to power the anti-lock brake
system (ABS) on towed vehicle(s).
In most cases, the ABS power will
be supplied through the Auxiliary
circuit on the primary 7-way trailer
light line connector. If the vehicle
was manufactured with a switchable
Auxiliary circuit for trailer accessories,
an additional 7-way connector would
have been provided for trailer ABS
power. In either case, the ABS
power line on the vehicle will be PLC
equipped.
CAUTION
Do not splice into the non-switchable
Auxiliary circuit on the primary 7-way
trailer light line. Doing so may cause
the trailer ABS to malfunction. This
circuit is dedicated for trailer ABS
power. To add a switchable auxiliary
circuit, contact a dealership.
Vehicles and trailers built after
3/1/01 must be able to turn on an
In-Cab Trailer ABS Warning Lamp
(per Federal Motor Vehicle Safety
Standards (FMVSS) 121). The industry
chose Power Line Communication
(PLC) as the standard method to turn
it on.
NOTE
Trailers not equipped with PLC can
not turn on the In-Cab Trailer ABS
Warning Lamp.
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Y53-6060-1C1 (03/17)
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