moxnix Reader
April 26, 2013 7:47 a.m.

2006 ford E-350 Every time I shift the van into reverse the trailer backup/running lights fuse blows.

It does this when the trailer is hooked up and when it is unhooked so it is not the trailer.

The van backup lights work fine.

Fuse is fuse 24 under the hood (Trailer tow running lamps and back-up lamp relays) Are there any known issues or where should I start troubleshooting on this? (I dislike wiring issues)

mad_machine MegaDork
April 26, 2013 7:49 a.m.

I don;t know of any known issues.. but I would start with the switch that controls your reverse lights and work your way back.

wae Reader
April 26, 2013 8:13 a.m.

I had the same problem on my way to the $2011 Challenge in my '06 E-150. I pulled the "Trailer Backup Lamps Relay" out of the PDC under the hood and all my problems were solved.

I've had the relay sitting here on my desk at work ever since I got back from the Challenge that year and one of these days, I swear I'm going to test it to see if the relay is bad. Some day. I gave the wiring a quick look and didn't see anything that looked like it would be shorting out, and it happened with or without the trailer hooked up, so I know the problem is on board the van somewhere. Since everything works without that relay and my trailer doesn't have any reverse lights or a surge brake that needs to be defeated, I haven't been all that motivated to find out exactly what's going on.

iceracer UberDork
April 26, 2013 9:53 a.m.

check the trailer wiring.

wvumtnbkr HalfDork
April 26, 2013 10:19 a.m.

Don't back up.

wbjones PowerDork
April 26, 2013 12:05 p.m.
iceracer wrote: check the trailer wiring.

he said it did the same thing whether the trailer was hooked up on not

1988RedT2 UberDork
April 26, 2013 12:15 p.m.
wvumtnbkr wrote: Don't back up.

+1

Stop me if you've heard this one:

A man goes to the doctor. "Doc, it hurts whenever I do this!" Doc says "Don't do that!"

‘Doctor, doctor, I think I’m suffering from déjà vu!’ ‘Hang on! Didn’t I see you yesterday?’

‘Doctor, doctor, I think I’m a dog.’ ‘How long have you felt like this?’ ‘Ever since I was a puppy!’

‘Doctor, doctor, I think I’m a bridge.’ ‘What’s come over you?’ ‘Two cars, a truck, and a coach.’

‘Doctor, doctor, I think I need glasses.’ ‘You certainly do. This is a garage.’

‘Doctor, doctor, I keep thinking I’m invisible.’ ‘Who the hell said that?’

moxnix Reader
April 26, 2013 1:41 p.m.
wae wrote: I had the same problem on my way to the $2011 Challenge in my '06 E-150. I pulled the "Trailer Backup Lamps Relay" out of the PDC under the hood and all my problems were solved.

Thanks. Just tried that and that will at least stop me from blowing fuses until I figure it out since I have electric brakes and I can live without backup lights on the trailer if it even has them.

I swapped the Trailer backup relay with the running light relay right beside it (same part number) and the fuse still blew so looks like it is not the relay.

I have been trying the don't back up method and it works about as well as the rhythm method.

So I guess it is isolated to van wiring past the relay

wae Reader
April 26, 2013 1:49 p.m.

Well, I guess you saved me from having to get around to testing this relay :)

Honestly, the only thing that I've ever personally seen the backup light power connection do for a trailer is to defeat the surge brakes so that you can reverse a trailer equipped with them. If you're motivated enough to try to actually fix the problem, I'd probably start in the connector under the bumper. I hear those are prone to being invaded by water and getting corroded and shorted out.

iceracer UberDork
April 26, 2013 5:17 p.m.
wbjones wrote:
iceracer wrote: check the trailer wiring.

he said it did the same thing whether the trailer was hooked up on not

Yeah I got confused with trailers and backup lights.

You'll need to log in to post.

Also on Grassroots Motorsports

MX-5 Cup Racing: Live on Your Screen This Friday and Saturday

1 day ago in News

Catch all the action of the Global MX-5 Cup race at Road America live this weekend.

How to Run Compressed Air at Home

1 day ago in Articles

A guide for installing an air compressor and air tools in your home garage.

2017 Volkswagen Golf SportWagen TSI 4Motion

1 day ago in New Car Reviews

Say hello to the Volkswagen Golf SportWagen TSI S with 4Motion. It comes with a turbocharged 1.8-liter engine that is ...

You Need This: $1600 Street Racer Ford Festiva

2 days ago in News

It already has a GRM sticker and everything.

Get Your Subscription Combo Deals!

2 days ago in News

Get both our magazines for the price of one!

Your Projects: smokindav’s VW GTI Project

2 days ago in News

Love a good MK5 GTI? You might enjoy this build thread.

Wing It: Simple Talk on the Complex Subject of Aerodynamics

2 days ago in Articles

Whether sleek, boxy or somewhere in between, all cars interact with the air while racing down the track.

2018 Acura TLX V6 A-Spec

2 days ago in New Car Reviews

Acura is introducing something new for the 2018 model year: the Acura TLX V6 A-Spec. It's the highest trim level ...

You Need This: 1989 Suzuki Swift GTi

3 days ago in News

For sale: one of Suzuki's under-appreciated hot hatches.

Buyer's Guide: Chevy Cobalt SS

3 days ago in Articles

All the information you'll need on GM’s entry in the sport compact wars.

Wednesday Night GRM Live: Are You Using the Right Chemicals for the Job?

3 days ago in News

What do all these cans even do!?!?

Project SVT Focus Gets Caught Up on Maintenance

3 days ago in Project Cars

Once again, some off-road action sent our project focus under the knife.

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

Also get your instant access to the digital edition of Grassroots Motorsports Magazine!

Learn More
5jFLgu0X2oFdj0gxsarRlz6e569sgVWK