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Old 06-22-2016, 07:40 PM   #1
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Not charging from tow vehicle

I noticed yesterday at a grocery stop that even though my TV was running, my battery had dropped to 12.2v. I switched my fridge to propane and continued to camp where I had a plug-in available. I checked my fuse in the truck and it's good.

When I get home I plan on getting the multimeter out and seeing what I can find, but thought I'd ask here since I'm always open to the idea I missed something stupid....
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Old 06-22-2016, 08:02 PM   #2
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What's your tow vehicle? Did it ever charge the trailer?
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Old 06-22-2016, 08:03 PM   #3
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Being this an a frame subforum....my tingling spider sences tells me this is an a frame camper.....

To the origional poster...have your conections checked at your vehicles out pin...most will do it for free...

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Old 06-22-2016, 08:29 PM   #4
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Could be several things. New Trucks many times have the wire harness for the charging pin, but it is not hooked up to the TV power. One some vehicles there is even a relay to prevent it from draining battery when TV not running. Check that there is a fuse is in the TV fuse block. If there is 12V at the charge pin, it it most likely due to the gauge of the wire for the 12V aux. If you have a slightly dirty Bargman connector, you can get 1-2V drop before you get to the battery. The 12V aux ( unless modified) will maintain a full battery with no real ( non parasitic CO/Propane detector) current draw at best.
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Old 06-22-2016, 08:55 PM   #5
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Some 7 pin connectors are hooked up to the battery and some are not and the only way to check is to meter Pin 4 of the connector. Use a meter or 12 light tester to tell and all recommendations say to always start a trip with fully charged battery and this should keep it topped off. Personal I do not run my Fridge on 12vdc while traveling I switch from home AC to propane while on the road.
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Old 06-22-2016, 09:11 PM   #6
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Here's a diagram of the 7 blade RV plug so you can verify the source of the problem, Truck side or Trailer side, terminal #4.
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Old 06-22-2016, 09:16 PM   #7
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Quote:
Originally Posted by 05CrewDually View Post
What's your tow vehicle? Did it ever charge the trailer?
x2....I wish Luv70sFord would reply, my 2015 F150 does the same thing, even though all the trailer lights do work,.... dealer says there is nothing wrong, but my tester says there is a problem......
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Old 06-22-2016, 09:46 PM   #8
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Sorry, signal goes in and out here. TV is a 2010 Ranger, 12v was run from the battery to the 7 pin by my dealer. I'm unsure if it ever charged but I'm leaning towards no. I only recently got an actual guage installed in the camper and just happened to check while stowing groceries.

I'll be checking with a meter when I get home. Very possible it's truck side. Power goes from battery, through a 20 amp fuse, an unknown rating circuit breaker, and then to the back of the truck. I wasn't impressed by the initial install, none of the crimp and seal connectors had been shrunk. This is begging for failure in 6 months where I live. See it all the time on the semis I work on. I went through and sealed them all, but I didn't verify anything, even after questioning why you would run a fuse before a circuit breaker.

When I get home I'll be tearing it apart after researching proper wiring installs first. Wanna make sure I get it done right.

Fwiw I'm an ASE master tech, and I feel so foolish. I think a cheap harbor freight meter is being added to my toolbox before my next outing.
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Old 06-22-2016, 11:23 PM   #9
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You can get a coupon from a magazine in most cases and get the HF meter for free. I have one in every vehicle and one in the Wildcat.
The way you describe the shoddy work by the dealer, if the truck is at fault, I'd be tempted to start over with a new circuit breaker and a roll of 12ga wire and do it right.
Best of luck and let us know how you make out.
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Old 06-22-2016, 11:58 PM   #10
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In my experience, the 12V from the TV is not sufficient to run the fridge without it also pulling from the battery when driving. I use a battery disconnect switch to isolate the battery from the camper 12V system if the fridge is running on 12V.
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