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Old 04-11-2012, 08:44 AM   #1
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Join Date: Apr 2012
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Default Trailer light issue

I am having an issue with my 2003 T-139 outside lights. I just purchased the RV used. I just added a 7 wire connector on my 2000 GMC Sierra truck, and all the pins are working correctly (tested with test light), but when plugged to RV...nothing. My question....there is no battery in the RV. Could this be the problem? I wouldn't think so, as the lights on the RV should just run through the truck lights.

Any ideas?

Thanks in advance,
Steve Bauer
Daphne, AL

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Old 04-11-2012, 09:08 AM   #2
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Default How about the inside lights?

When the 7 pin is plugged in and there is no battery on the trailer, do the inside lights work? If the inside lights work and the outside lights do not, I would suspect a fuse. The fuse box is next to the converter, usually.

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Old 04-11-2012, 10:24 AM   #3
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I'll try the inside lights when I get home today. Thanks.
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Old 04-11-2012, 11:52 PM   #4
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I just bought the exact same year and model, also without a battery,
and my lights work.
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Old 04-12-2012, 05:38 PM   #5
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Your clearance lamps and brake/turn signal lamps should work with no battery installed. Those lines are direct connects from your tow vehicle to your trailer; they don't go through the converter (your outside trailer vehicle lights (not the porch light) are powered by your tow vehicle with no trailer fuses involved, your tow vehicle provides the fused connections for those lights) or your battery to operate. More likely you have a broken wire somewhere, or a bad ground. If you have power from your truck's #3 pin, then the trailer's wiring is at fault. If you don't have power at the truck's #3 pin, then the truck's wiring is at fault. You would have to check the 7 pin connector on the trailer for continuity if the truck is actually ok. It may be possible ( I don't know how you "tested" your truck's pin out power) that your truck isn't providing the power. Many vehicles made since the development of "computer" control (CAN Bus) are not set up for towing if the vehicle did not come from the factory with the "tow package". For instance, if you bought a Jeep Grand Cherokee without the tow package and added your own hitch and 7 pin connector, the connector would not function properly. You would also have to add two relays and a fuse in the under-hood distribution panel in order to actually have light and brake power for the trailer...

Your interior lighting may or may not work with no battery installed no matter what your truck's output is. Some converters require a battery as a "filter" for passing current to your trailer's interior lights so, interior lights, unless you know your converter's ability, is not going to be a good test...

My 2 cents, your mileage may vary...

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Old 04-15-2012, 09:30 PM   #6
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Sorry I'm late on this reply. Apparantly, the connector on the trailer had some issues.....I sprayed some cleaner into the contacts, and plugged it in and out a few times to the truck, and it started working. Went on a weekend trip Friday, and all is well. Thanks for the replies.


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