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Old 06-20-2014, 12:45 PM   #1
1 Rivet Member
2006 16' International CCD
Los Angeles , California
Join Date: Nov 2011
Posts: 8
Help! Rear trailer light stays on!

Help please, I am headed out solo Sunday morning on a long road trip.
I plugged in my Bambi to my vehicle and began to check the lights.
The rear right light on the trailer remains on (static) until i unplug the
trailer. The left light is fine, turn signal and brakes light work. What to do?
Time crunch.

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Old 06-20-2014, 01:32 PM   #2
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2012 27' Flying Cloud
W , New England
Join Date: Oct 2012
Posts: 5,743
Hi Olive. Sounds frustrating!

There's an answer on etrailer for your question:

Hope that's of some help. If you don't have 12v testing tools, I'm not sure how you'll troubleshoot this. Good luck!!

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Old 06-20-2014, 01:34 PM   #3
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1970 23' Safari
2005 30' Classic
1986 31' Sovereign
Lorain , Ohio
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Betting it's a potential backfeed from the ground of that light.

I had this on my 1970 Safari with extremely rusted sockets. I installed diodes to stop the problem, but that was a work around, not a fix.
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Old 06-20-2014, 04:07 PM   #4
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2005 19' Safari
Join Date: Aug 2004
Posts: 2,450
Sounds like a chassis ground problem.

The electrical ground connection should be through the umbilical harness, but sometimes the pins are corroded or dirty. Try mating and unmating the umbilical a couple of times to clean the pins. If you have contact cleaner, give the umbilical pins a good spray. Alternately, you can use isopropyl alcohol or WD40. However, WD40 will leave an oil residue that will attract dust and dirt; so wipe the excess oil off of the terminals, after spraying.

Sometimes, an intermittent ground may be caused by a poor electrical connection through the trailer ball/hitch. Do you have the trailer connected to your tow vehicle (TV) with the ball carrier and hitch? If you don't have the ball hooked up, this could be the problem. Hook up the trailer hitch, like you are ready to pull out.

Even if the ball and hitch are hooked up, rust and/or dirt/grime on the ball or in the tongue could be preventing a good electrical connection. Try jumping up and down on the TV bumper or tongue of your Airstream. If that doesn't help, jack up the tongue up and off of the ball, thoroughly clean the ball and tongue, grease the ball and hook up the ball and hitch again.

If all else fails, you may need to check the wiring in the 7-pin umbilical connector to make sure a wire hasn't pulled loose somewhere under your TV.

If you still have a problem, post back in this thread again...
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Old 06-20-2014, 10:11 PM   #5
1 Rivet Member
2006 16' International CCD
Los Angeles , California
Join Date: Nov 2011
Posts: 8
lights on lights off thank goodness.

thanks all,
it turned out that the plug that went into the car had lost the center portion and needed to be replaced along with some work on the contact box?
inside the vehicle.
Anyways it is working now.
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