Trailer fuse blows

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Aug 25, 2010 | 04:33 PM

aphotic26

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From: Canada

Trailer fuse blows

Hey folks I have a 2001 F250 SD with 276,700 KM

This is not a related superduty question but its worth a shot.

I need my lights working on my trailer, its a single axle 3500lb 10 ft and I added two marker lights on the fender. I have two marker lights nicely wired to the green/brown wire, everytime with a 20A fuse it blows, I tried a 25A but nothing will turn on...once I disconnect the marker lights they everything else works.

Im working on it as we speak and having problems trying to resolve it.

Thanks folks

Aug 25, 2010 | 04:56 PM

cdrmotorsports

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From: Lancaster, MA

First, don't up the fuse to a 25A, that'll just cause more problems if it melts something. So the problem has to be with the marker lights that you added. Are you sure you are wiring them in to the correct wire? Most trailers just use brown as a running light wire. I'd check with a test light just to make sure. If you are sure you have the correct wire, make sure that the wiring isn't grounding out somewhere or anything like that.

Aug 25, 2010 | 08:48 PM

RV_Tech

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From: Bristol, TN.

If it's blowing a fuse, it has a short and, as already noted, putting in a larger fuse is not the way to go. For just marker lights, you are liklely already overfused.

Steve

Aug 25, 2010 | 09:04 PM

cdrmotorsports

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From: Lancaster, MA

Rv_Tech is right. I'm pretty sure the fuse is only supposed to be a 10A for the trailer running lights.

Aug 25, 2010 | 09:39 PM

Pinky Demon

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Having the same problem. The #6 Trailer Tow Turn/Stop relay is a 20 amp fuse FYI.

Aug 25, 2010 | 10:07 PM

kparret

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Joined: Mar 2010

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Not sure why your marker wire is green/brown. Should just be a brown wire if it's an OEM or professional install. Might explain your blown fuses. If you have a multimeter, I'd check it each pin to make sure it's wired up right.

See this helpful information on eTrailer:
Trailer Wiring Diagrams | etrailer.com

Aug 26, 2010 | 10:57 AM

cdrmotorsports

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From: Lancaster, MA

Quote:

Originally Posted by Pinky Demon

Having the same problem. The #6 Trailer Tow Turn/Stop relay is a 20 amp fuse FYI.

Right, be he's having a problem with the running lights, not the turn or stop lights. Those are on different fuses. There are many fuses for the trailer tow package.