Trailer Help!!

False! My truck will light up any trailer as yours should as well. Check your fuses & breakers.

 

Did you use an electric cord that is know to be good, that's the easiest thing to fix. Otherwise it's simple enough to use a test light and check to see what works the way it should on that cord and what doesn't. Is this an ABS cord (green) or older style (black)? Is there a switch anywhere in the truck for a trailer dump valve? The wiring may have been modified to allow for that.

Too late now, but it's a good idea to have you regular mechanic check out any truck or trailer you're considering. If you got it from a dealer I'd have him fix it since it's not roadworthy like this.

 

Not true. Trailer manufacturers use the same hook up, doesn't matter if its a van,flat,stepdeck,reefer,grain etc. If the lights worked hooked to another tractor you don't have power to the pig tail or your cord has an issue. Pull the plug from the tractor and use a test light. Turn on all the lights and check each prong. If you have power at the tractor check the cord. If no power at back of the tractor check your fuses and then the wiring. Most wiring problems on a tractor are in the cord. It gets bounced around pretty good and connections get bad. Shouldn't be too hard to figure out unless there's a short between the fuses and the tractor plug. That can be a pain but its not likely. Your plug at the back of the tractor or the cord is probably the culprit. Good Luck.

 

Manufacturers, yes, they are standardized. Once in the hands of someone else things can and get modified. It was easy to run the wiring for a dump valve through the pigtail via the connection for the upper marker lights which don't exist on a flatbed in their circuit. I did mention to first check the truck with a trailer cord that is known to be good. I wanted to point out a possibility that could be the culprit and wouldn't be something that the majority of people are probably aware of. Usually more than one way to troubleshoot electrical issues.

 

I still think you should check your fuses & circuit breakers first... Much easier & quicker then running a test light. Then if your fuses & breakers are fine, then do the test light. I blew the breaker for my trailer lights last week...... That is the only reason why I suggest that.

 

trace the top lights wireing back and trace the plug wire to the top level lights on the pig tail. Should be an easy fix !!! Also make sure you have all the prones cleaned on the pig tail. If a truck has run a lot of coastal runs it could have salt build up as well.

 

Should be a box on that trailer for the fuses as well. And a circuit box