Thread Tools Search this Thread Display Modes
Old 08-20-2011, 08:33 AM   #1
2 Rivet Member
2011 28' International
Rock Hill , South Carolina
Join Date: Sep 2007
Posts: 34
Clearance lights issue

The last time I pulled my 2005 International, the clearance lights didn't work. I traded it for a 2011 International (28 it!) and the first time I towed it the clearance lights didn't work. A few days later, my 2007 GMC 2500 HD diesel gave me an error message in the system, telling me to check the trailer wiring (it has an internal trailer brake control system). I took it to my dealer and they said they could find nothing wrong and that GM had put out a technical bulletin on this and what it referred to with "excessing clearance lights." I was told it was a grounding issue between the trailer and truck. I was told to do things like make sure the hitch ball was properly greased, which I normally do and have so for years. All this sounds a little strange and just plain incorrect to me. Has anybody else had this issue? Thanks.

jsprad is offline   Reply With Quote
Old 08-20-2011, 08:45 AM   #2
Rivet Master

Southwestern , Ohio
Join Date: Nov 2006
Posts: 1,669
The error message sounds strange to me, too, but you have to remember, high on the list of computer truisms is, "Error messages almost never indicate the actual problem."

Late model GM products factory wired for towing have fuses for all the trailer circuits in the main fuse box under the hood. The first thing I would do is check that fuse.

If that isn't it, you need to check for voltage at the trailer running lights pin of the tow vehicle end of the trailer cable. Years ago I built a "break out box" with a 7 pin plug on one end and a 7 pin socket on the other so I could get at all those circuits. Has saved an awful lot of time over the years.

Nuvite-F is offline   Reply With Quote
Old 08-20-2011, 09:02 AM   #3
Rivet Master
mimiandrews's Avatar

1966 22' Safari
Weatherford , Texas
Join Date: Jun 2008
Posts: 1,483
Check for a relay

Don't know about your truck, but in our Dodge, there is a relay in the tail light circuit that provides power to the trailer running and tail lights. The power comes through a different fuse at (or near) the main panel. The theory behind this is that a lot of running lights, etc. on a trailer would pull too much current through the truck's headlight switch and burn out the switch.

In any case, when the parking lights come on in the truck, power from that circuit closes the relay. That provides power to the trailer plug for its running and tail light circuit.

Therefore, with one bad fuse or one inoperative relay, there will be tail and parking lights on the truck, but nothing at all on the trailer.

Suggest you check your truck's trailer connector to see if there's power to the correct pin when the parking lights are on.

These people have great wiring diagrams and drawings of which pin in the connector goes to what.

Trailer Wiring Diagrams |
mimiandrews is offline   Reply With Quote
Old 08-20-2011, 09:28 AM   #4
2 Rivet Member
2011 28' International
Rock Hill , South Carolina
Join Date: Sep 2007
Posts: 34
Thanks, guys. I will keep looking and testing.
jsprad is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Electrical issues with clearance lights 1987_345 Classic Motorhomes 13 08-25-2011 08:13 AM
Back-up Lights - TV - issue Pinchy Lights - Interior & Exterior 3 05-10-2011 06:24 AM
Replace clearance lights Okiegent Lights - Interior & Exterior 0 03-04-2011 08:43 PM
Minus these lights SilverHoot Lights - Interior & Exterior 20 02-13-2011 09:04 AM
Bedroom lights won't work! julieibach Lights - Interior & Exterior 1 01-24-2011 10:14 PM

Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:38 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.