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Old 09-13-2011, 08:24 AM   #11
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Join Date: Aug 2011
Posts: 13
I need more info for some of you to answer my question better. The trailer is 100 miles from here so right now I dont have info on the fridge. I will have to check on the output of the truck alternator. It is a 2003 GMC 3/4 ton HD with an 8.1 engine.
We had the trailer at the dealer for some minor repair and I turned the fridge on before leaving there. It came on just like it was supposed to but after about 1.5 hours towing it was off. I'm not sure the batteries were fully charged on the rv but I thought the truck charging system would keep them up enough to run the fridge. The trailer stay's in one place most of the time anyway but if we do travel I'm hoping to not have to empy the the fridge while on the road or at least would be nice for it to stay cold. Probably not really a big deal . I was just expecting it to work.
Thanks for everyones input.


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Old 09-13-2011, 10:37 AM   #12
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Join Date: Mar 2008
Location: Louisville, KY
Posts: 7,114
First thing is to make sure your truck socket battery lead is operational.
Some trucks must have a fuse installed in order for the Trailer battery
connection to be hot at the truck rear bumper socket.

One way to tell this is with a meter.
Here is a photo of the typical 7 pin socket found on the back end of many

Notes- the notch is at the TOP in this photo.
The left side is looking at the truck socket with the door held open.
The right side is looking at the BACK wire side of the socket.
You're just interested in the left photo.

You should read about 15 volts between the 1 o-clock battery pin and
the 7 o-clock ground pins with the truck engine running.

It's possible your truck battery to RV socket fuse is bad or missing.
I believe it's found in the fuse block under the hood but it's been 7 years
since I had to install mine so I'm not exactly sure.....

Check this first! Maybe it will solve your problem.
Good Luck!

Dan & Rita D
2017 Nissan Titan 5.6L King cab 4wd
1999 Suzuki Intruder Motorcycle
Blue Ox WD hitch

Camping days 2010-53, 2011-47, 2012-41,
2013-41, 2014-31, 2015-40, 2016-44, 2017-63, 2018-30
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Old 09-13-2011, 10:58 AM   #13
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Join Date: Aug 2011
Posts: 13
I checked this last weekend with a test light. Did not have a volt meter on hand but it did light the test light so I assume battery voltage.

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