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I have a 1998 GMC Safari that I pull a small camper. The camper has a 7 pin plug and the OEM towing package 6 pin socket. The wiring at the plug has 3 wires for running light, left turn signal and a right turn signal. There are 3 additional wires in the harness, one is for ground, and there is a black for electric brakes (on the camper) and a red constant power for charging the battery in the camper. Both were not wired in the socket at the factory. My question is, where are the other ends of each wire in the harness. Someone stated there were 2 wires under the carpet on the drivers side front . Any ideas where the wires are? Could they be connected to the fuse block? monsond
 

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01 Astro Cargo RWD, 97 Astro Mark III AWD
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The brake wires will come off the brake controller once you install one. Not factory equipped.
The 12 volt hot is typically blue and run off a key on hot source. Also not factory equipped.
 

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2003 Astro LT RWD
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In my 2003 the electric brake controller wire end is up near the pedals, ready to be connected to a controller. I'm guessing if it's present in your van's harness in the back it'll be there in the front. Since my (boat) trailer has surge brakes I was more concerned with getting the reverse signal connected right (so I could back up without unintentionally applying trailer brakes) but that likely won't matter to you unless you're actually using backup lights on your trailer. The last controller I had was the "pendulum" type which needs to be mounted nearly horizontally and pointed in the forward direction. I think some of the newer types have more flexible mounting options but it was hard to beat the no-fuss nature of the old one.
 

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Common Sense + Critical Thinking
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Make sure to use a self resetting circuit breaker for your brake controller. I'm sure it states that in the installation manual, but I have seen some shady stuff done before.

I recommend a manual reset circuit breaker for the 12v constant to the trailer.
 
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