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Old 06-22-2012, 06:22 PM   #1
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Wiring problems

My Montana 5th wheel running lights will not come on. Turn signals work, brake lights work, left tail light works. No top lights work and only a couple of side lights work. Where should I start looking?

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Old 06-22-2012, 07:11 PM   #2
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What year is your Montana? Maybe they are burned out.

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Old 06-23-2012, 07:49 AM   #3
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2007, and the bulbs are good. I've checked them in the lights that do work. R
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Old 06-24-2012, 05:34 PM   #4
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Not sure what you have as a tow with. The newer trucks have a seperate fuses, some under the hood, some under dash for the traler light functions. You can also turn your lights on and take a test light and check the functions of each circuit at the RV plug on the tow unit. Hope this helps.
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Old 06-24-2012, 06:45 PM   #5
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I backed in a boat once and forgot to unhook my trailer lights first! I blew out the trailer turn and brake fuses on an2001 GMC Yukon XL, found out then that it had separate fuses under the hood for the trailer circuits, then separate ckts for the tow vehicle itself. Test plug will show if truck plug is giving power to camper circuits.
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Old 07-04-2012, 09:20 AM   #6
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Clearance lights are generally on the same circuit as the tail lights. Since the tail lights work you have power coming from the truck to the trailer. My guess is 1) you have no ground to the lights that aren't working, use a jumper wire from a good ground to light that isn't working and see if it lights up if it does clean up the mounting screws and go to the next light, repeat 2) The hot wire has a bad connection or splice in it, this is usually in one of those "blue" clamp on splices. Use a meter or test light to check for power in and out of each splice you can locate. Since all these lights are on a daisy chain if you find the bad connection all the lights should work.
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Old 07-04-2012, 12:55 PM   #7
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Another suggestion.
I had the same problem on our Colorado last year the night before a trip.
After removing all bulbs and not finding anything wrong, just happened to be tracing the wires at the rear of the trailer and found they had routed the wire harness right around the sharp end of the right frame rail. It had rubbed the insulation off the wire and was grounding to the frame rail. However it did not blow the fuse.
Only noticed it as it was right before sundown, and I saw a spark as I was moving the harness.
Check your wire harness anywhere it is accessible under the trailer.
Good luck


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