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Old 08-18-2011, 09:30 PM   #1
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Question bad battery no 12v from TV

I have a quick question....just got back from a trip that was a few hours long, and found the fridge was barely cool. Checked and found that the fuse at the battery was blown... I hooked the truck back up, and realized that there were no lights, or anything else 12v. Shouldn't the trailer have full 12v power from my TV? Or does the break in the battery circuit kill all 12v power to the remainder of the trailer?
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Old 08-18-2011, 09:36 PM   #2
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You need to double check if your 7 pin is putting out 12 volts. By default the GMC +12 is not hooked up - you have to install a fuse in what they refer to as "stud 1" under the hood (I assume it is still the same on a 2011). If it had the tow package - it should have come with a brake controller harness and usually there is a fuse taped to the harness.

There are also two fuses located in your load center that could be causing the issue, but my guess is the under hood fuse.
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Old 08-18-2011, 09:50 PM   #3
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I have the truck all set up....12+ volts at the 7 pin(that was an earlier issue a few weeks ago!) ...once the fuse was back up and working, all 12v items in the trailer worked fine. I also tested the truck power by pulling the fuse and the voltage into the fuse line while connected to the TV as 13v...yet no lights in the trailer...put the fuse back in, lights work...
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Old 08-18-2011, 10:36 PM   #4
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Ok so not sure I totally understand where you are...

Here is how it is setup --

Battery <-> fuse <-> TV power input from 7 pin <-> Load Center reverse polarity fuses <-> Load Center -> trailer lights

If your lights work when hooked to the TV, but don't work unplugged then check the battery/fuse/connectors. They can easily become corroded and even if the fuse it good, it will not work (ask me how I know!). If you have a multimeter, you should be able to put it on the battery and see mid 12 volts when the TV is not hooked up and then high 12 to 13 when the TV is hooked up.
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Old 08-19-2011, 06:26 AM   #5
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my apologies...running lights, signals, etc work fine...its the interior trailer 12v power that does not work when the umbilical is connected to the TV AND the battery fuse is out/blown or battery is disconnected. Should I be getting interior power straight from the TV? I understand that the microwave, television, etc, 120v stuff will not work, but I would expect the 12v things to work.
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Old 08-19-2011, 08:00 AM   #6
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When that fuse is blown you will have no power to the RV... as the cord goes thru that fuse....
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Old 08-19-2011, 11:15 AM   #7
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Originally Posted by bklabar View Post
my apologies...running lights, signals, etc work fine...its the interior trailer 12v power that does not work when the umbilical is connected to the TV AND the battery fuse is out/blown or battery is disconnected. Should I be getting interior power straight from the TV? I understand that the microwave, television, etc, 120v stuff will not work, but I would expect the 12v things to work.
It is my understanding, that the purpose of the 12v hot supply from the TV is for charging the TT battery. I think there is isolation built in at the TT, such that the TV only supplies the TT battery charge, and not the rest of the TT circuits. As I said, this is my understanding of the function, and looking at the wiring circuit would be needed to comfirm if I'm correct.
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Old 08-19-2011, 11:28 AM   #8
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On mine - there is no isolation and the battery fuse just goes to the battery --- so if the vehicle is hooked up and there is no battery (or fuse is blown) - YES - I do get power inside my TT. The +12 7 pin wire basically is spliced into the wire that goes from the battery to the load center.

Did you install the fuse under the hood of your TV? By default the 7 pin is NOT hot on a GMC and you have to install that fuse to make it work.
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Old 08-19-2011, 01:12 PM   #9
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I have a quick question....just got back from a trip that was a few hours long, and found the fridge was barely cool. Checked and found that the fuse at the battery was blown... Shouldn't the trailer have full 12v power from my TV?
Just curious??? My fridge works on 110v or propane. Not 12 volt.
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Old 08-19-2011, 02:00 PM   #10
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Just curious??? My fridge works on 110v or propane. Not 12 volt.
But the propane requires 12-volt to work.
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