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Old 02-09-2019, 05:31 PM   #1
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Batteries connected correctly?

I tried to hook up a battery disconnect switch today but it would not disconnect power. I tried on both the black cable and red cable on the right battery in the pic. Looking at my dual 12 volt batteries it appears my batteries may not be hooked up correctly. This is how they came installed from the dealer. We have roof mounted solar and those are hooked up to the left battery only. It appears my batteries arenít in parallel like they should be. Itís my understanding that the black cable on the left battery should be going to the RV for parallel. On mine the black cable on the right battery is going to the RV.Click image for larger version

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Old 02-09-2019, 05:51 PM   #2
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They look correct to me if I am understanding the two cables on the right go to the RV. I see pos of left battery connected to pos of right battery then to RV. Neg on Left battery connected to Neg on right Battery then to RV assuming frame. Looks like solar is connected to the left battery, but the batteries are connected together properly.
Looks like shutoff needs to go between the red cable on right and the Pos terminal on Right battery. The cut off may not work on the neg cable on the right battery as there may be a solar connection to the frame somewhere that is then connected to the left battery neg terminal.
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Old 02-09-2019, 05:56 PM   #3
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Agree, wiring looks correct. Did you disconnect shore power when testing the disconnect switch ? If not the converter will still power the 12V lights etc....
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Old 02-09-2019, 05:57 PM   #4
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You disconnect needs to be connected to the right battery. It needs to disconnect the RED cable on there right battery going to the trailer. It will not disconnect the color as it is only hooked to the left battery.
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Old 02-09-2019, 06:00 PM   #5
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Quote:
Originally Posted by TheGerman View Post
Agree, wiring looks correct. Did you disconnect shore power when testing the disconnect switch ? If not the converter will still power the 12V lights etc....


We werenít on shore power.
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Old 02-09-2019, 06:01 PM   #6
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You disconnect needs to be connected to the right battery. It needs to disconnect the RED cable on there right battery going to the trailer. It will not disconnect the color as it is only hooked to the left battery.


I put the disconnect on that red cable on the right battery. Still had power
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Old 02-09-2019, 06:07 PM   #7
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In your photo, every terminal has more than one connection. Any battery post cutoff switch cannot cut off wires going from the trailer to the same polarity on the other battery.

Ideal parallel wiring:

ALL trailer red wires would go to the left battery positive post - through the cutoff switch. There would also be a single cable going from the left battery positive post (bypassing the cutoff switch) to the right battery positive post - and that would be the only wire going to the right battery positive post.

All trailer black wires would connect to the right battery negative post. There would be a single black wire going from the right battery negative post to the left battery negative post.

The method I listed above is not my favorite. If you are paralleling 12V batteries, I prefer the 4 position marine battery switches ($30 on Amazon) so that you can parallel/unparallel the batteries with the switch, as well cutoff all loads. These switches will have instructions that show all positive load wires coming to one post of the switch, another red wire to + post of battery 1, and another red wire to + post of battery 2.

just my experiences
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Old 02-09-2019, 06:09 PM   #8
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Do a simple test: Remove both red cables from the right battery. If you still have power in the trailer there's some backfeed through one of the smaller wires on the left battery.
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Old 02-09-2019, 06:15 PM   #9
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It's pretty obvious the cables are not hooked up in a way that is optimum for a dual 12 volt battery setup (even disregarding the smaller wires that are hot connected to the left battery).

A dual 12volt battery system needs to have the feed/load positive to one battery and the ground/frame wire on the other battery.

With so many feed wires, it might be easiest to consolidate all the ground wires and the wire that goes to the trailer's Converter to the "dead"/Frame side of the disconnect switch.
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Old 02-09-2019, 06:22 PM   #10
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The diagram above is correct. Put a marine switch on the Negative wire before it gets grounded to the trailer frame any you're all set.

The 12vDC from the converter Negative wire should go to the trailer frame as well.

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