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Old 06-23-2016, 12:07 AM   #11
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Check the fuse that is at the end of your 7-pin cable that links to the trailer. Usually in a junction box. Had same problem and traced back to junction box and found a 30 amp fuse crammed into that mess of wires- and was blown! I replaced mine with a resettable fuse breaker so I don't have to search it out again!


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Old 06-23-2016, 12:49 AM   #12
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If you've got a Silverado, it may never have been hooked up (although if you have the fuse, it should be hooked up).

See this for hooking it up.

SilveradoSierra.com • How to Hook Up the Constant 12v Power for 7pin Trailer Plug : How-To Articles
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Old 06-23-2016, 01:03 AM   #13
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In most cases, the wiring from tow vehicle to 7 pin connector, then from 7 pin to rv battery is to small to charge the rv battery more than a modest amount. A very small voltage drop will result in zero charging. Simple ohms law. That circuit might minimize battery discharge, but it will never completely recharge a dead battery. At least thats been my experience.
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Old 06-23-2016, 02:04 AM   #14
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Quote:
Originally Posted by rockfordroo View Post
If you've got a Silverado, it may never have been hooked up (although if you have the fuse, it should be hooked up).

See this for hooking it up.

SilveradoSierra.com • How to Hook Up the Constant 12v Power for 7pin Trailer Plug : How-To Articles

See Post #8
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Old 06-23-2016, 07:14 AM   #15
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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.
Adding to what I said.

Here is a quick way to understand what is happening in the charging system.

Plug into the TV and disconnect the battery. Turn the fridge on 12V and use a volt meter to check the voltage at the fridge. Now reconnect the battery and check again. When I did this on a prior camper and TV, the voltage went up substantially. IIRC, it went from 8V at the fridge with just the TV to 12V with the battery connected.

If your readings show any voltage increase when the battery is hooked up, the fridge will be draining the battery to some degree.
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Old 06-23-2016, 07:21 AM   #16
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Ford missing relay

If it is a Ford TV, you may be missing a Relay.
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Old 06-23-2016, 10:47 AM   #17
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If it is a Ford TV, you may be missing a Relay.
please explain,.....I have a 2015 F150, a friend told me he "thinks" he remembers finding a relay in his glove compartment that he had to install,..... I only get 6v on the #4 pin not 12v, ...... I can plug in my Tekonsha 6562 7-Way Blade Tester and it doesn't show the 12v either, meaning "something is not right", .... all my trailer lights(brake, turn sig., backup, ect.) work correctly and I made the mistake of telling the dealer that, so they say everything is ok, "no Problem",..... but without the 12v it isn't going to charge the battery and "something is not right",.... I don't need it for my fridge, because it doesn't have 12v option, just 120v and gas,.....

this all came to light when I bought a Tow Ready 118019 7 Way Cigarette Lighter Plug Adapter a couple of months ago, that plugs into the 7 pin socket to give me an outside 12v socket for a small air pump,..... it didn't work on my new truck, but does on my old 02 F150, ..... I've googled many times over the last two months about missing relay and can't find any info, any info you can give about a missing relay would be appreciated............




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Old 06-23-2016, 10:52 AM   #18
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fella10:

I did a google and this was the first thing to come up. Hope it helps.

Auxiliary power in trailer problem solved. Easy fix - Ford F150 Forum - Community of Ford Truck Fans
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Old 06-23-2016, 11:14 AM   #19
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fella10:
I did a google and this was the first thing to come up. Hope it helps.
thanks rock, but I've seen that one, it deals with much older model trucks,.... I've even talked to Auto Zone hunting a missing relay and they suggest that since everything is controlled by the computer today and that since all lights do work, the 6v on pin #4 could be that because of the computer and that everything really is ok,...... a lot has changed since 2002, it may be that I don't have a problem, I was just interested when the "missing relay" was mentioned........
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Old 06-23-2016, 05:00 PM   #20
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I think I've seen postings of the relay on newer models; but can't tell you how new. Does your owners manual give you any clues?
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