I'm trying to provide power to my slide in camper via the wiring harness
Chevy provides which is located under the bed of the truck, toward the front
of the bed, on the driver's side. The harness has everything for a 5th
wheel (turn indicators, brake controller, etc), but I only want +12V and
ground. Both the manual and the label that is on the harness indicate that
white is ground and red is battery. I've verified the ground (white) wire
is a good ground and that the battery (red) wire isn't providing +12 volts.
I checked the fuse block under the hood on the drivers side and the fuse
that's labeled as "trailer bat" looks good. It's dark out and I'm tired of
holding a flashlight and a multimeter. I plan to resume and/or contact the
dealer in the morning, but wondered if someone here might have the answer
Thanks in advance. Because I'm starting a 10 day trip some time tomorrow,
whether I have power to the camper or not, I might not see and/or reply to
any answers until my return. This is kind of a "shot in the dark" (pun
Many times Chevy installs the wiring harness but if the truck doesn't come
prepped with the tow package then the proper fuse and/or relay won't be
installed. The trailer wiring harness that came with my '04 2500HD had a
page of instructions that showed where to install the relay in the
under-hood electrical center, but everything had already been put in place
(either by the factory or the dealer) so mine was all powered up and ready
If the line you are trying to get power from is the circuit for trailer
brakes, then you might be out of luck because that won't get power unless
you have a brake controller installed, and even then not until you have it
set correctly and are using your brakes.
The other thing to consider is that on 12v systems white is seldom ground
(like in 120v AC house wiring). Black is commonly the ground, but it could
be set up differently for the harness because I have seen white ground wires
You might also want to check the circuit with the truck running. It may be
wired so that the trailer/camper won't draw power unless the alternator is
turning to prevent drawing down the truck battery when parked. I don't have
the 5th wheel harness but I believe on the 7-pin connector on the back of my
truck I don't have constant power to any of the leads without the truck
running. The turn leads for the turn signal, brake and running lights all
have power but are all switched (not constant).
Cheers - Jonathan
I have no power to the either the 5th wheel harness or the 7 pin connector
at rear trailer hitch even when the engine is running, but all the other
pins get voltage when that circuit is active (i.e. stop, turn indicator) so
there is a common issue somewhere. Thanks for your help. I may just have
to do without being able to charge the battery in the camper this trip.
Apparently it wasn't connected, even though it has the heavy duty towing
package. The manual didn't have instructions; it only stated that if it
wasn't wired already the dealer could do it. The dealer had it wired in
about 30 minutes, no charge as I purchased it for the express purpose of
putting the camper on.
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