I recently bought a travel trailer. but when i hook up the trailer to my truck which has a factory tow package i get running lights and right signal but no brake lights, Lh signal ,back up or brake lights. i brought home a set of temporary towing lights with a four pin adapter and all i get is running lights and thats it!
any suggestions as to where to start?
Thanks
Vance
all of the wiring diagrams i found on line don't match the colors on the back of my plug?
You'll need to disconnect the wires from either the truck connector or the trailer connector...
I highly suggest purchasing a voltage checker- it looks like a screwdriver with a pigtail of wire with an alligator clip on the end. The tip of the 'screwdriver' has a point for probing. The light in the probe will light up...makes it easy to trouble shoot without a helper behind the trailer.
Hook the aligator clip to a good positive grounding point on the bumper or frame(not painted).
then pin by pin on the truck connection, stick the probe on each terminal tab.. and write a simple diagram where you find brake, tail, backup, etc...
Then i'd suggest, taking the connector off of your trailer, exposing the wire ends.
Run again thru your diagram and turn on each light of the truck. As you do, touch the wires from the trailer to that specific terminal. (make sure your ground wire is attached on the trailer) you can mark each wire with a piece of tape and label it which is which.
then simply attach your trailer wires according to your diagram to the terminals in the connector... that should get you in business..
hope that makes sense...
That way if the factory wiring harness remains the same, you'll be able to use it with other trailers if the need arises..
Here is a diagram for the standard trailer wiring.... see how this compares with yours....
http://rvbasics.com/techtips/rv-travel-t...
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thanks for the advice i put a multimeter on the truck plug and located all the lights but there appears to be 2 black ground wires because there's 8 wires going into the plug and 7 pins ?
i now have brake light on the lh side the rh side lights go out. but now i have signal lights on both sides so i'm getting closer.
do you thing its a bad ground on the rh lamp assembly causing the lamps to go out when the brakes are applied?
i really appreciate the advice. thanks
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