Posted: Aug 29 2009 at 12:10am | IP Logged

I am having a simila problem.  Bought the truck with the towing package in place and for the past couple of years I've been towing my work trailer with no issues.

Recently the running lights stopped working and very soon afterward I lost all lights on the trailer.

After replacing the 10amp fuse for the trailer, the running lights started working again.  However, I can't get turn signals or brake lights to work.  I've replaced the relays and checked all the fuses, but I still can't get anything on my test light.

As a precaution I've begun re-wiring my trailer and found a few bare wires, probably causing shorts.

But, even with changing the fuses and relays under the hood, I still can't get anything to work. 

Any ideas?