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Old 11-10-2015, 01:39 PM   #1
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Tow Cable replaced no more 12V to RV from TV

Hello,
I replaced the cable that connects the RV to the TV.
Everything works but the charge to the RV Battery.
I get 12V from the TV plug.
I get 12V to the junction box of the RV
I think i connected the TV hot to the the RV hot in the junction box.
The only problem.... Can't power the RV. Can't charge the RV battery either; brand new BTW.
Does anyone knows if there is a fuse that i can check somewhere in the RV?
Does anyone knows if i can check the Hot in the junction box if i charge the battery?

Thank you for your time.
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Old 11-11-2015, 01:14 AM   #2
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RV = general terms
Is this a trailer/5th wheel/motorhome?

You said you have power to the 7 pin plug, to the jbox.
Just keep following the wire with a test meter and check +12v & -grds
Maybe you will find a circuit breaker, switch or loose connections.


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Old 11-11-2015, 08:11 AM   #3
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There is usually a fuse or short circuit device near the battery. It may be blown. Ours is hidden behind the battery compartment. If it's a TT, they're usually underneath the tongue or just under the front cap.
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Old 11-11-2015, 05:14 PM   #4
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5th wheel.
I have power to the jbox from tv.
I do not have power to jbox when I check the hot and ground coming from rv battery
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Old 11-11-2015, 05:15 PM   #5
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I'm looking for that fuse can't find it anywhere
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Old 11-11-2015, 05:18 PM   #6
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Can't see any fuses
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Old 11-11-2015, 05:23 PM   #7
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Follow positive lead back towards battery and you should find in-line mini-breakers that can be re-set by pressing small black button....
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Old 11-11-2015, 05:25 PM   #8
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Look for one like this between the battery box and the trailer wall.




Press the little black reset button.
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Old 11-11-2015, 05:29 PM   #9
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In your picture there is a small rectangular device with two posts in it and the black wire looped to it. That is an auto-reset circuit breaker. It should have continuity through it. They're bad about not self-resetting and need to be replaced if they're showing an open circuit between the posts.

It also looks like the other devices are manually resettable breakers.
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Old 11-12-2015, 07:10 AM   #10
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Well Looks like the little black button on that connector may have been the coulprit.
Last night I was play with it, i replaced the self resetting one and while there i decided to touch that little black button. It clicked.
Now i'm discharging the battery to test if there is anything else that may interrupt the power from my tv to the rv; i really think that was it though, couldnt get any power from the hot wire at that side and after resetting it i did.

Will keep you posted.

Meanwhile Thank You All
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Old 11-12-2015, 11:05 PM   #11
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And that was it.
That little black reset button.
Thank you again for pointing me to the right direction.
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Old 11-12-2015, 11:14 PM   #12
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And that was it.
That little black reset button.
Thank you again for pointing me to the right direction.

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Old 11-13-2015, 09:02 AM   #13
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Glad you found it and glad it was an easy fix. You'll know what to look for next time.
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Old 11-26-2015, 08:23 AM   #14
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Awesome guys! I was getting no 12v power to my trailer as well and stumbled across this post...pushed little black button and problem fixed! Thank you!
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Old 02-21-2016, 06:36 PM   #15
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Newbie here. Picked up our 26dbh and while turning into our driveway the cable got stuck on something and tore. I just installed a replacement and all of the lights, turn signals work but I don't seem to be getting any 12v power. As I said I am new to this so I apologize if this is a dumb question, but even if the battery is just about dead shouldn't the act of plugging the 7 pin into my car provide me with power to interior lights, power tongue jack, etc?
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Old 02-22-2016, 12:29 PM   #16
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Did you have 12 volt power inside before this happened?

If so, you probably blew the fuse or Short-Stop near the battery. Some of them have reset buttons on the side.
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Old 02-22-2016, 12:41 PM   #17
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Look for a fuse like this.
There is a tiny button on one of the side.
It works like a gfi it trips and shuts the power down.
That what happened to me
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