In order to determine the specific problem you will need to purchase a circuit tester if you do not have one - the very handy Cordless Circuit Tester # PTW2979 would be my strong recommendation due to how easy it is to use - and test the connector on your vehicle after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring.
If the signals... view full answer...
It sounds like there was a short or there is still a short that is causing some problems. To determine if the problem is on the vehicle side or the trailer side there is a test you can do. First unplug the trailer from your 2008 Dodge Nitro. Then use a circuit tester such as # PTW2993 to test the wires going into the converter box and the wires coming out.
Someone will need to sit in the vehicle and activate the lighting functions while you test. If all of the wires are correct coming... view full answer...
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