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The T PARK fuse in the rear fuse-relay block supplies battery positive voltage to a separate park lamp circuit connected to the trailer wiring harness..
For trailer wiring, separate turn signal circuits are connected through the GMSF to the trailer wiring harness.
Fuse Block - Rear
Beneath the left rear seat
Trailer TR/PARK fuse 42 10amp
although I have not experienced this problem in the exact vehicle you have, General Motors has had problems with the turn signal switches in many of their vehicles. The turn signals may still work properly, but the electric signal from the brake light switch passes through the turn signal switch (also called a combination switch) before it goes to the brake lights. I assume you have no problem shifting out of park or you would have mentioned it, which tells me the brake light switch is functioning properly. First thing to do, as always is to check for blown fuses. If it is a blown fuse, you then need to determine what caused the fuse to blow. If you have towed a trailer recently, it could have been faulty wiring in the trailer, or it could be faulty wiring in the trailer lighting harness of the Escalade.
If the brake and turn signal are on the same bulb than you can Orin straight wiring. If the brake and turn signal are on different bulbs than you'll need a wiring harness with a converter box.
I'm pretty sure the wrangler has the brake and turn signal on the Same bulb so let's start with basic trailer wiring.
The green wire on the trailer harness is for the right side turn and brake for the trailer. This wire should be attached to the wire on the vehicle that supplies power to the right turn signal/ brake light.
The yellow wire is the left turn signal, brake light on the trailer and should be attached to the wire on the vehicle that supplies power to the left turn signal /brake light.
The brown wire is the tail lights on the trailer and should be attached to either the left or right side wire on the vehicle that supplies power to the tail lights.
The white wire is grounD and it is vitally important that this wire be attached to the vehicle in a manor that supplies a good ground. Failure to suppy a good ground will result in all kinds of funky problems with the trailerer lighting such as all the lights linking when the tail lights and turn signals are on at the same time.
If you have any specific questions I will be more than happy to try and help.
First check the fuses. There may be one for trailer running lights. Check also power at the harness. If the brake lights and turn signals are seperate, there has to be a converter from 5 to 4 wire. For the power to feed back to the brake lights it sounds like the vehicle wiring is direct and not using a converter... or one of the bulbs on the trailer is contacting both contacts. Try http://www.etrailer.com/faq-wiring.aspx and maybe get a simple 4 pin tester that plugs into the 4 pin connecter. Hope this helps.
check to make sure you have park light power coming out of truck connector, if you do then check power at trailer lamp,may have bad bulbs, there two filaments in a bulb one for brake/signal and thr other for park lights.
try http://www.etrailer.com/faq-wiring.aspx. They have very good concise information that might help. You can take a 12 volt test light and check your fuses also. Touch each side of the fuse on the metal part that is exposed. Use your emergency flashers to do this. The turn signal/brake light fuse will only power when it is in use. Check owners manual as there are probably seperate fuses for the trailer and the vehicle. There is probably a connector under the vehicle near the back... usually above the spare tire that can come loose, but not likely unless it is broken. Hope this helps, Mike