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

Concours d’Lemons to Ruin Monterey Car Week Yet Again

2 hours ago in News

What started as the anti-concours has transformed into a major event on the Monterey Car Week schedule.

You Need This: A Quite Eye-Catching Green Over Red Ferrari

3 hours ago in News

Not your usual Ferrari color combo.

We're Back In Monterey for Car Week

3 hours ago in News

And so it begins, another trip to Monterey Car Week.

Your Projects: JDM Autozam AZ-1 Kei Car

4 hours ago in News

What are the realities of importing a JDM kei car to the U.S.?

Tonight on Grassroots Motorsports LIVE! Lee Grimes of Koni Shocks

22 hours ago in News

This may shock you, but suspension is arguably the most important part of going fast.

Classic Motorsports Monterey Welcome Party Welcomes 2000-Plus Gearheads

1 day ago in Articles

Last night we threw a party, and more than 2000 people came to celebrate.

You Need This: E46-Chassis BMW M3 for $6000!?

2 days ago in News

Could this M3 donate its heart to your next project?

Deal of the Month: Free Trackside Companion!

2 days ago in News

Ever wished you had a handy guide on how to dial in your alignment or adjust your dampers?

This Tuesday: Join Us at Track Night in America

2 days ago in News

This Tuesday we'll be running at Palm Beach International Raceway

Experience Monterey With Us

3 days ago in News

We're on our way out to Monterey, California, for car week.

Tomorrow, August 15: Join our Monterey Kickoff Cruise-In

3 days ago in News

Our Monterey welcome party is taking over all of downtown Pacific Grove.

Vintage Views: Classic Mini

6 days ago in Articles

Turn heads, have jolly good fun.

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

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

Learn More
8QtGHqxHDYIlrF4cL53lcppjAQeZ5mYZ