Auxiliary Battery - GMC 2003 Sierra 1500 Pickup Owner's Manual

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If your vehicle is equipped with the "Heavy-Duty
Trailering" option, please refer to Heavy-Duty Trailer
Wiring Package, earlier in this section.
When the camper-wiring harness is ordered without the
heavy-duty trailering package, an eight-wire harness
with a seven-pin connector and separate CHMSL
connector are located at the rear of the vehicle and are
tied to the vehicle's frame.
Auxiliary Battery
The auxiliary battery provision can be used to supply
electrical power to additional equipment that you
may choose to add, such as a slide-in camper.
A
If your vehicle has this
provision, this relay will be
located on the passenger's
side of the vehicle, next
to the auxiliary battery.
When using this provision, connection should only be
made to the upper stud (A) of the relay. Do not
make connections to the lower stud (B) of the relay.
The auxiliary battery circuit is protected by a megafuse
located behind the auxiliary battery.
Be sure to follow the proper installation instructions that
are included with any electrical equipment that you install.
Notice: When using the auxiliary battery provision,
the electrical load must not exceed
30
amps.
Always turn off any electrical equipment when not
in use. Leaving electrical equipment on for extended
periods will drain your battery.
4-9
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2003 sierra

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