Let's try this again.
Hi, I got a Logan trailer that I tow with F-350. The trailer had a 6 way plug on it, I replaced it with a 7 way. I checked my work with my truck and everything worked. My friend hooked up his F-150 and the lights did not work. The next day I hooked up my truck and nothing. I have not checked the plug on the F-150 but both trucks are wired from the factory so I'm thinking that they are both good. The F-150 does not have a brake contoler but that should not make a difference. I took the plud apart on the trailer and everything looks good. Using a test light and disconnectind all the wires and starting over. White wire is the ground. Brown wire is running lights (test light is on but no trailer lights) Yellow and green are turn lights (test light is on NO flash and no lights on the trailer). Red wire (black plug connector) is hot (test light is on). Black wire (blue plug connector) trailer brakes (for some reason I'm not fast enough to push the brake pedal and run to the back of the truck to see if the test light is on or not). I am thinking that there is a problem with the main wiring. I tried to trace the wires to see if I could find a short or anything. The cable goes through the step plate on the trailer tounge then up into the the floor of the tack room. The cable does not come into the tack room. Is there space between the floor of the tack room and the metal plate? I have not been able to see where the wires are routed to the back of the trailer. All thoughts, suggestions, and inputs welcome. Is there some way of finding out where and how Logan ran the wires?
Thanks,
Bru

Hello Bru .. Welcome to the forum...
You could contact Loagn.

© 2005 Carriage Industries, the maker of Logan Coach Brand Products - P.O. Box 746 Logan, UT 84323 • 800-742-7047

Or you could check the grounding of your trailer. I've found that most electrical problems are ground related. The screw that bonds the wire to the frame looks good... But underneath there's a layer of oxide that breaks the circuit. Each light, brake coil, even the main wire should be suspected. When the problem is found, reattach the ground wire using "nolox" or similar aluminum wire electrical grease. The Nolox prevents the oxidation in the contact area.

As for checking the brakes, get a stick and jam it between the brake pedal and the seat front. You're not trying to apply the brakes, just make the brake switch come on. Use a wadded up rag to protect the seat.

Hooked up to the trailer the other day and everything works fine. It's got to be a bad ground. I talked to Logan and they gave me some info on where and how the wiring runs. One of these days I will pull it out of the mud and trace the wiring. Thanks for your thoughts and help.
Bru