wiring problem - Automotive Wiring and Electrical


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Auto Repair Home>> Automotive Repair>> Automotive Wiring and Electrical

Kjell
New User

Jun 18, 2008, 12:17 PM

Post #1 of 4 (1439 views)

wiring problem	Sign In

I have a 1993 ford F-250, I'm having problems with the backup light for my trailer. The wiring on the trailer checks out okay. I check the wiring in the plug ( black with a green tracer) and it has no power at all. Check the fuse under the hood and its okay. The backup lights on the truck are working just fine.

Any ideas would be helpful

Thnak You

Kjell

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 18, 2008, 12:27 PM

Post #2 of 4 (1437 views)

Re: wiring problem	Sign In

You do mean BACK UP LIGHTS - right? Ok - I didn't think those came on any regular harness that the truck might have come with and not part of the common 4 wire trailer lighting so it must be added or tapped into the wire going to the trucks bulb. Just adding one a couple days ago on a truck I own - Chev but no matter. Light was for boosting the truck's back up lighting not for a trailer though.

You probably have to chase it back to find where it taps in. If that is a maze of trouble perhaps just get to the truck's back up light bulb and run a new wire.

If this is elaborate back up lighting for the trailer it may have been or need to be set up thru a relay to not overtax the wiring and fusing of the OE lights. Trailer stuff can be all different,

T

Kjell
New User

Jun 18, 2008, 12:32 PM

Post #3 of 4 (1435 views)

Re: wiring problem	Sign In

My truck has a 7 prong plug and is wired for backup light for the trailer. There is no power to that wire.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 18, 2008, 12:57 PM

Post #4 of 4 (1432 views)

Re: wiring problem	Sign In

If not just a simple light it might in fact be wired to a separate fuse/relay. Guess I would start where it's not working at the plug on the truck and chase forward or just maybe see something after market for trailer wiring and check there. I don't really think there's an industry standard for all the assorted needs for trailers. There is a definate color code for the 4 wire ones.

Problems with these is freqently where they tapped into existing wiring especially any done where the elements can get at them, water, road debris, dirt, whatevers and any added wire need to be secured so it doesn't rub with normal vibrations. Here - wiring where clots of slush/snow/ice pack up behind wheels on wiring in the winter months raises hell,
T

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