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Old 05-08-2021, 06:36 PM   #1
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What type of wirings needed to connect batteries together?

Hi Guys. New to RVs, just purchased a class C a month ago. I will be doing quite a bit of boondocking so purchased 2 12volt batteries for the coach. Iím getting ready to hook them up and wanted to know what Gauge size to use to wire them together. The wire size throughout the coach is 8. The end wires that connect to the existing battery are #2. Do I have to also use 2 gauge to hook up the batteries together or would 4 gauge be ok?
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Old 05-08-2021, 08:00 PM   #2
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If there's a fuse in the 2 gauge wire, you may want to stay with the same size to the next battery.

If the fuse is to high for 4 gauge wire, it could overheat it, causing a fire hazard.
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Old 05-08-2021, 08:46 PM   #3
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Technically with a parallel pair of 12V batteries the current through the jumpers is only half, and being a short run (a foot or two) the voltage drop would be minimal so one could "get away" with using a lighter gauge. Conversely, being just a few feet of cable there's really no economy in making the jumpers light, so my vote would be to make them the same gauge of whatever the primary feed is.

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Old 05-08-2021, 09:40 PM   #4
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Technically with a parallel pair of 12V batteries the current through the jumpers is only half, and being a short run (a foot or two) the voltage drop would be minimal so one could "get away" with using a lighter gauge. Conversely, being just a few feet of cable there's really no economy in making the jumpers light, so my vote would be to make them the same gauge of whatever the primary feed is.

Mark B.
Albuquerque, NM

Yea I think Iím jut going to go with the same gauge. I just couldnít find the 2 at my local auto parts stores, they only had 4. Iím going to check Home Depot in the morning
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Old 05-08-2021, 09:41 PM   #5
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Yea I better just be safe then sorry.
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Old 05-09-2021, 05:04 AM   #6
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You also have the flexibility to go to a pair of 6V GCs in series as the jumper in that case carries the full amps. Of course you could use 2 smaller ones for the series jumper.
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Old 05-09-2021, 09:04 AM   #7
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You also have the flexibility to go to a pair of 6V GCs in series as the jumper in that case carries the full amps. Of course you could use 2 smaller ones for the series jumper.
That was the original plan but I can’t find any 6v that will fit under my steps where the battery set up is. They are too tall. I can only fit about 10” tall
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Old 05-09-2021, 08:55 PM   #8
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Yea I think Iím jut going to go with the same gauge. I just couldnít find the 2 at my local auto parts stores, they only had 4. Iím going to check Home Depot in the morning
Amazon has a large selection of various gauge jumpers of different lengths.
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Old 05-09-2021, 09:49 PM   #9
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Welding supply stores are great places to have custom cables made.
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