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Old 01-21-2016, 04:26 PM   #1
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Uuugghhh! Yet another problem!!

Why does it never end??

As some of you know I just put brand new batteries in my new trailer (they were bad) but it was the fridge heater draining them while dry camping, that has also been fixed.

Anyway during all of this I noticed the "jumper" cable they used to hook the 2 batteries in parallel seemed pretty thin to me.
So today I decided to switch them out with a little heavier battery cable even though everything was working fine until this point.

When I switched the cable, as soon as I connected them in parallel one battery (the one the trailer is running through) started boiling. I took a picture before I disconnected it so I know it is hooked up correctly.
So why is this happening???
As usual your help is very appreciated!!! Thanks!!!
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Old 01-21-2016, 04:29 PM   #2
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Can you post the picture?
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Old 01-21-2016, 04:35 PM   #3
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Without pictures, it makes me think you accidentally shorted out something. You connected + to + and - to -?
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Old 01-21-2016, 04:55 PM   #4
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Yes - to - + to +
if there is/was a short how do you fix it?
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Old 01-21-2016, 05:21 PM   #5
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Don't have a clue about the "boiling" but those two wires connecting - to - and + tp + are WAY to small. Look like maybe 12 or 14 gauge? Replace them with 6 or 8 gauge.
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Old 01-21-2016, 05:55 PM   #6
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The closest battery has a Red wire, and the farthest battery has a Black wire. Both wires are coming from the same direction.

What are they connected to?

I agree with others, use heavier gauge wire for the parallel cables.

Here is one source for cables.
Custom Battery Cable Assembly Custom Made Genuinedealz.com
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Old 01-21-2016, 06:10 PM   #7
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Haha that is what started this mess in the first place - I don't like those wires either!!


I fixed the problem!!! I went to check fuses when I noticed the controller had some crazy numbers on it. So disconnected it, then reconnected the battery (with much thicker cables) and the batteries were fine! Then I reconnected the controller and now all is back to normal....controller must of has a glitch when I was messing with the batteries.


Thanks again guys!!!!


PS The wires asked about going to pos on one battery and neg on the other is the solar.
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Old 01-21-2016, 06:45 PM   #8
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Quote:
Originally Posted by emm-dee View Post
Don't have a clue about the "boiling" but those two wires connecting - to - and + tp + are WAY to small. Look like maybe 12 or 14 gauge? Replace them with 6 or 8 gauge.
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Old 01-21-2016, 06:53 PM   #9
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It is possible that when disconnecting and reconnecting the jumper wires that you caused the controller to change a setting. I would connect the two wires from the controller to the same battery. When connected should not make a difference, but depending on the order of reconnecting the jumpers it is possible you you could cause a problem. Many solar controllers recommend you do not disconnect the battery with the solar panel providing power to the controller.
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Old 01-21-2016, 06:59 PM   #10
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For the best battery life, charging, and power utilization, the white negative wire on the top battery in the picture should be on the negative terminal of the bottom battery. the + to + and - to - cables need to be much heavier, the same size or on larger than the cables to the trailer.
what's the small red wire on the positive post of the bottom battery?
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