The power module with a built in relay is bad. when i hook a trailer up to my tow hitch my right blinker and right break light do not work. The wires are good and all fuses are good. I brought it to the dealer and they finally decided this is the issue. They told me the name of the part over the phone but i cant remember what it is called.
I think you might be talking about the "Trailer Lighting Converter" or the "Tow Ready" Tail Light Converter, or they may call it a trailer light module. This module plugs into the vehicles OEM harness. If this failed then you could have such symptoms. But they could also be talking about the "Trailer Light Socket" (your trailer electrical plug plugs into this socket). I hope this helps. If not try to give more details. Good luck.
SOURCE: no tail lights or running lights
Next step, replace the Power Distribution Module. It probably has a short in it also. Why in the hell anyone would think it was a good idea to put the fuse box with two circuit boards in it(not properly sealed) is beyond me. I wonder if they would take their lap top into the shower to see if it would still work. Please make a complaint about this poorly designed product at this site. www.nhtsa.gov Chrysler should take responsibility for this problem. I think they keep their company afloat with all the modules they sell.
SOURCE: LEFT TRAILER TURN SIGNAL DOES NOT WORK
I'd get a 12vdc test light if you don't have one already & start from plug, and keep probing back from there. It may be as simple as a bad connection under truck where joined into harness.
SOURCE: factory 99 dodge trailer plug wiring
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..
SOURCE: LEFT TRAILER TURN SIGNAL DOES NOT WORK
I have seen once before that the fuse box was bad on a 2003 Dodge 3500. I had power in and nothing out. We had to replace the box. Not cheap! Hope it is simple like a loose connection though. I think I had to pull the inner fender on the drivers side to access the bottom of the fuse box. Pain in the ****, but...
SOURCE: Need wirering diagram to hook up trailer lights and elecric break
Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info. With the tow package, there should be a plug under the dash... far left above the emerg. brake petal. The harness that plugs into it should have came with the truck, or you can order one to fit it. Did thew truck come with a 7 pin plug on the back? If not you can order one from the above mentioned site. They also have the wiring colors.
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