another trailer light thread....
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New User
Joined: Apr 2014
Posts: 4
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another trailer light thread....
Sorry for another one but trailer light dont work right. If the running lights are on the brakes dont work. If the running lights are off the brake lights work fine. I cant drive at night this is a huge issue for an up and coming transporter. Its not the trailer lights ive eliminated that with my plug checker. Is it the rely? Blown fuse? Or common ford electrical mess up?
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
It sounds very much like a ground issue.
When to much current is drawn, the ground resistance drops to much voltage across the resistance due to the extra current flow of both light circuits..
Your tester won't tell that.
Good luck.
When to much current is drawn, the ground resistance drops to much voltage across the resistance due to the extra current flow of both light circuits..
Your tester won't tell that.
Good luck.
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
yes, ground is bad. If your connected to the ball, it should help ground. Clean the rust a off the ground wire bolt and make sure everything is clean. You can also use a jumper cables to ground the bumper to the trailer hitch as a test.
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