Color wire for series connection - SailNet Community
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Color wire for series connection

So red is positive, and black or yellow is negative.

Is there a specific color wire to use when connecting the positive terminal of one battery to the negative terminal of another when wiring in series?

I realize this isn't terribly important, but I'm curious. The examples I've seen use black.
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Re: Color wire for series connection

Anytime I connect to a positive, I use red, no matter where it goes.
I've seen some battery installations w/the yellow and I just plain do not like it. Black won't discolor or fade. It's a good color for negative, just like green is a good color for ground. I've always dreamed of building a boat that has every single wire color coded and no two wires aboard are the same color. Imagine how easy it would be to identify a wire you find running behind the ceiling or the overhead.
If someone is so colorblind they can't tell red from black, then perhaps they have no business doing electrical work, just like those who can distinguish red or green can't get licensed as a captain. Sometimes one must play the cards they are dealt.

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Re: Color wire for series connection

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Originally Posted by Minnesail View Post
Is there a specific color wire to use when connecting the positive terminal of one battery to the negative terminal of another when wiring in series?
It is very important that you determine the exact voltage midpoint on the connecting wire and tape black around the negative half, and red around the positive half.

The alternative is to use a dark maroon color, but it must be precisely the Pantone value halfway between red and black.

Anything else is dangerous, unseaman-like, and your insurance will drop you like a rock.

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Re: Color wire for series connection

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It is very important that you determine the exact voltage midpoint on the connecting wire and tape black around the negative half, and red around the positive half.

The alternative is to use a dark maroon color, but it must be precisely the Pantone value halfway between red and black.

Anything else is dangerous, unseaman-like, and your insurance will drop you like a rock.

Bwaaaaa haaaaaaa!



I can imagine the order to a wiring supply: I need five inches of red and five inches of black spliced with a butt connector, with ring terminals on either end.

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Re: Color wire for series connection

The wire from the load to the battery positive terminal will be red. The wires between the batteries will be black. The wire between the battery negative terminal and the load will be black.

The red wire circuit cannot touch any black wire circuit or you will get a short circuit and let all the smoke out.
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Re: Color wire for series connection

For series jumpers we use a red wire with a black and red shrink on the respective ends. Don't for get to label the wires too. If the jumpers are labeled, color coded and the right length it will be harder to mess it up..


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Re: Color wire for series connection

Thanks! I've seen mostly seen black, but I like the idea of color coding the terminals.

Are those four 6-volt batteries run series and parallel to make a 12-volt bank?

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Re: Color wire for series connection

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Originally Posted by Minnesail View Post
Thanks! I've seen mostly seen black, but I like the idea of color coding the terminals.

Are those four 6-volt batteries run series and parallel to make a 12-volt bank?

That bank is four Lifeline 6V batteries, in series/parallel, for a 600Ah bank. Also note the fuse location which is within 7" wire inches from the main positive connection to the bank... The only thing not shown in that image are the terminal boots. They hide the wire labels so the image was shot before the terminal boots were installed.

We prefer to slit the cable end of the wire boots so the can be installed after the wiring is done as they just get in the way otherwise.



You can then cut slits for other wires entering the terminal, and wire tie the flap.
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Re: Color wire for series connection

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Originally Posted by Maine Sail View Post
For series jumpers we use a red wire with a black and red shrink on the respective ends.....
We have several series jumpers to create 24v banks for our thruster, windlass and winches (each are dedicated). All use red wire, as MS described, with alternate shrink wrap.

Clearly, some black electrical tape would do a sufficient job, as well. I've even seen the neg end of a red jumper that had black sharpie written on it. Not as tidy, but effective and perfectly useful.

OP's answer is red.
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