Trailer wiring problems
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Freshman User
Joined: Oct 2006
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Trailer wiring problems
i broke the plug-in on my 99 superduty a while back and i finally decided to replace it, but i have no power to anything except the 2 turn signals. i unbolted the ground on the frame and cleaned it up with a grinder. i then traced the wires back all the way up to the engine bay and undid the plug up there and still only had power to the turn signals. is there anywhere else the problem could be
Junior User
Joined: Aug 2009
Posts: 52
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You did check the fuses? I'm not sure about your truck's model year and harness, but my 2003 has separate fuses for the trailer connector.
Other than that you would have to get a diagram and do a trace-through. If you have a meter or better yet a test light with a very sharp probe you could perce the insuation and look at where the power stops. Test lights work better than meters for finding a high resistance connection, in case the harness has had water in connections.
I also suggest when you work on wires under the vehicle you clean them all up with denatured alchohol and then wrap them with a vapor wrap putty. I think some window and body sealers are of the proper texture. It is like a black elastic putty that bonds and seals. It never hardens. We use it on cellular and two-way antenna and power connections on tall towers to keep water out of connections. Another thing that works well is black vapor free silicon, the kind safe for electronics, but it is harder to remove later.
Tom
Other than that you would have to get a diagram and do a trace-through. If you have a meter or better yet a test light with a very sharp probe you could perce the insuation and look at where the power stops. Test lights work better than meters for finding a high resistance connection, in case the harness has had water in connections.
I also suggest when you work on wires under the vehicle you clean them all up with denatured alchohol and then wrap them with a vapor wrap putty. I think some window and body sealers are of the proper texture. It is like a black elastic putty that bonds and seals. It never hardens. We use it on cellular and two-way antenna and power connections on tall towers to keep water out of connections. Another thing that works well is black vapor free silicon, the kind safe for electronics, but it is harder to remove later.
Tom
Cargo Master
Joined: Jun 2008
Posts: 2,752
Likes: 5
From: Stillwater, OK
7 pin?
LT = good
RT = good
Tail -> check the fuse in the box under the hood
Brake -> how did you check it? Many TBC's won't turn on if no trailer is connected.
AUX -> is it connected? Fuse?
REV/AUX -> does anyone really care?
GND -> good thing this one doesn't show 12v
4 pin?
LT = Good
RT = Good
tail -> Check the fuse
GND = Good...ish?
LT = good
RT = good
Tail -> check the fuse in the box under the hood
Brake -> how did you check it? Many TBC's won't turn on if no trailer is connected.
AUX -> is it connected? Fuse?
REV/AUX -> does anyone really care?
GND -> good thing this one doesn't show 12v
4 pin?
LT = Good
RT = Good
tail -> Check the fuse
GND = Good...ish?
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