GMC Duramax Diesel 2015 Owner's Manual page 37

9-10 Driving and Operating
2. Open the hood and unwrap the
electrical cord. The cord is in the
engine compartment, on the
passenger side of the vehicle,
near the battery.
3. Clean and dry the heater cord
and connector ends. Check the
heater cord for damage. If it is
damaged, do not use it. See
your dealer for a replacement.
Inspect the cord for damage
yearly.
4. Plug it into a normal, grounded
110-volt AC outlet.
Warning
Improper use of the heater cord
or an extension cord can damage
the cord and may result in
overheating and fire.
Plug the cord into a
three-prong electrical utility
receptacle that is protected
by a ground fault detection
function. An ungrounded
outlet could cause an electric
shock.
Use a weatherproof,
heavy-duty, 15 amp-rated
extension cord if needed.
Failure to use the
recommended extension cord
in good operating condition,
or using a damaged heater or
extension cord, could make it
(Continued)
Warning (Continued)
overheat and cause a fire,
property damage, electric
shock, and injury.
Do not operate the vehicle
with the heater cord
permanently attached to the
vehicle. Possible heater cord
and thermostat damage could
occur.
While in use, do not let the
heater cord touch vehicle
parts or sharp edges. Never
close the hood on the
heater cord.
Before starting the vehicle,
unplug the cord, reattach the
cover to the plug, and
securely fasten the cord.
Keep the cord away from any
moving parts.