Trailer Brakes Trouble
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Joined: Jun 2010
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Trailer Brakes Trouble
Hi
I got a 1986 F-150 5.0 EFI. I have a trailer with a four prong so I wired the 4 prong connector onto my Ford. I connected White* (ground) to ground (of course). I connected the Brown* (Tailgate) to a brown wire that gets power when ever you turn the headlights on. The Green* (Right Turn) I connected to the right turn signal. And the Yellow* (Left) I connected to the left turn signal.
Now I connected the trailer. I flip the signals, and they blink on the trailer
. I hit the brakes, they brakes light up . I turn the headlights on, the light on the trailer turn on . I hit the brakes while the head lights on turned on, and they turn OFF on the trailer 
. WHY!!!! WHY!!!! WHY!!!! I don't know why!. Anyone have any idea why?
I got a 1986 F-150 5.0 EFI. I have a trailer with a four prong so I wired the 4 prong connector onto my Ford. I connected White* (ground) to ground (of course). I connected the Brown* (Tailgate) to a brown wire that gets power when ever you turn the headlights on. The Green* (Right Turn) I connected to the right turn signal. And the Yellow* (Left) I connected to the left turn signal.
Now I connected the trailer. I flip the signals, and they blink on the trailer
. I hit the brakes, they brakes light up . I turn the headlights on, the light on the trailer turn on . I hit the brakes while the head lights on turned on, and they turn OFF on the trailer . WHY!!!! WHY!!!! WHY!!!! I don't know why!. Anyone have any idea why?
Senior User
Joined: Nov 2002
Posts: 486
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From: Cochranville, PA
Here is a good article on exactly what you are experiencing. It may help.
Trailer Lighting Problems: All Lights Go Out When Brakes Lights Should Be On - Moderated Discussion Areas
Do the trailer lights come back on when you step off the brakes?
Trailer Lighting Problems: All Lights Go Out When Brakes Lights Should Be On - Moderated Discussion Areas
Do the trailer lights come back on when you step off the brakes?
Last edited by Coneynew; Apr 26, 2011 at 08:31 AM. Reason: typo
Thread Starter
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New User
Joined: Jun 2010
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Thanks, It helped a little. From what i read there, the brake lights on the truck are robbing the power from the trailer ones?. And yes the lights do come back on when I get off the brakes. Also Instead of grounding the trailers ground to an actual ground, I ran a really long cable from the negative of the battery to the ground on the trailer. Would that affect it, (i don't see how it would)
Posting Guru
Joined: Sep 2006
Posts: 1,781
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You might want to change the name of this post so it tells people that it has to do with the lights and not trailer brakes. Two different things and you might get more of a response if they knew it was just lights and not trailer brakes.
