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Tail lights on trailer not working

post #1 of 15
Thread Starter 
My 2007 Ford's stop, rear, and turn signals work but not the trailer's stop, brake, or turns signals.

I don't know when they stopped working. It is a flat plug system to my boat trailer and also has a round female plug for trailers with electric brakes. I use only the flat 4 wire connection for my boat trailers.

The plug has a green, brown, yellow, yellow/ green, yellow/ brown, and a white ground. I am getting power to the brown wire only. All of the harnesses seem to be solid, no disconections anywhere.

I want to go fishng but can't until the trailer is safe, it's a 25 mile run each way through town.

Is there a module in the truck that is not working?

Thanks for your help
post #2 of 15
If all the trailer lights are out I'd start with double checking the ground on the trailer.
post #3 of 15
Being that all your lights are not working, it's probably something with the ground, or at the plug connection. You can also check the fuses in your truck. My 2002 Silverado has a seperate set of fuses for the trailer wiring independent of the truck's light.
post #4 of 15
Those problems are usually a bad ground. I suggest you buy a 4-way tester


and test the car/truck first. They cost $3 to $7 and fit on your key chain. This simple, cheap little device is worth it's weight in gold.

If the car/truck wiring is good, then clean all the connections on the trailer, especially the ground. If still not working, report back. Good luck.

.
post #5 of 15
Quote:
Originally Posted by Bass Ackwards View Post
Those problems are usually a bad ground. I suggest you buy a 4-way tester


and test the car/truck first. They cost $3 to $7 and fit on your key chain. This simple, cheap little device is worth it's weight in gold.

If the car/truck wiring is good, then clean all the connections on the trailer, especially the ground. If still not working, report back. Good luck.

.


I've never seem one. Where do you get them?
post #6 of 15
Trailer lights are pretty straight forward , I was gonna say check the ground wire also.
post #7 of 15
Quote:
Originally Posted by Monza View Post
I've never seem one. Where do you get them?


Walmarts, automotive stores, ebay, they are all over the place.
post #8 of 15
Quote:
Originally Posted by Bass Ackwards View Post
Those problems are usually a bad ground. I suggest you buy a 4-way tester


and test the car/truck first. They cost $3 to $7 and fit on your key chain. This simple, cheap little device is worth it's weight in gold.

If the car/truck wiring is good, then clean all the connections on the trailer, especially the ground. If still not working, report back. Good luck.

.


Thanks for sharing this info. I can definitely see the value! I usually have an issue or two during the season on my little boat and trailer. I'll be picking one up this weekend.
post #9 of 15
Thread Starter 
Thanks for all the replys.

The clearance lights and tail lights on the trailer do work but the turn signals and brake lights do not.

The truck's brake and turn signals do work, but not the trailer lights. That is why I asked if there was some kind of a module/ switch/ fuse, in the truck that might be bad. There doesn't seem to be any up-plugged wires or fuses blown in the truck, I could be wrong.

I can probably cut into the truck wiring and re-run to the plugs but that is a last resort if I can't find problem.
post #10 of 15
[quote=edsr;8327475]Thanks for all the replys.

The clearance lights and tail lights on the trailer do work but the turn signals and brake lights do not.

The truck's brake and turn signals do work, but not the trailer lights.

The brake light and the turn signal are the same filiment. Check the bulbs
post #11 of 15
I had the same problem and found a worn ground wire. 5 minute fix and I was back in business.
post #12 of 15
Thread Starter 
Jersey- Will search that ground better, thanks.

CCB - tested the lights/ bulbs, they are working.
post #13 of 15
Quote:
Originally Posted by edsr View Post
Thanks for all the replys.

The clearance lights and tail lights on the trailer do work but the turn signals and brake lights do not.

The truck's brake and turn signals do work, but not the trailer lights. That is why I asked if there was some kind of a module/ switch/ fuse, in the truck that might be bad. There doesn't seem to be any up-plugged wires or fuses blown in the truck, I could be wrong.

I can probably cut into the truck wiring and re-run to the plugs but that is a last resort if I can't find problem.



My truck has the additional fuses for the trailer wiring in a box under the hood, separate from the fuse panel inside the cab. The wiring diagram and fuse placement should be on the underside of the fuse box cover.
post #14 of 15
Before you go crazy..How long has the trailer been sitting with out use?How long has the ball been sitting on the truck without use?

Most definatly a bad ground..If they have been sitting for the winter months, The trailer tongue inside gets rusty and so does the ball as well..If they are rusty they are not connecting to each other well. Clean them up.

When the trailer sits on the ball it get grounded to the truck.If there is rust on both.well thats the bad connection..Dont be cutting into anything untill you made sure the Ground is 100%..

Then you'll be doing all that work for nothing.. I am sure its simple if the last time you used the trailer and truck everything was working..
post #15 of 15
Just use a jumper wire from the truck to the trailer, make sure it has a good bite into the metal,,, thats the fastest way to check your ground
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