Battery cable

rodsnguns

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Joined
Jan 18, 2026
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2
Hello, New here. I have a 1977 Johnson 70 hp and I am trying to determine the AWG size of the existing battery cables. There are no markings on the current cables. Any input would be appreciated.
 

alldodge

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Mar 8, 2009
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43,665
Interesting read for a guy that is not an electrician. Will be making a copy for my shop wall, thanks ! Just one question, does it make any difference whether a solid wire or multi stranded wire ??
Solid wire should only be used where vibration is not an issue. The current carrying capability is higher for solid wire but not that much more
 

cyclops222

Captain
Joined
Mar 21, 2024
Messages
3,217
I only use stranded Copper wire for battery cables.
NOT Copper coated strands of wire.
Many places sell Copper coated wires.
Engines that take lots of cranking time. WILL WILL cause the non Copper wire to heat up. Reducing the full current to to a lower amount.
Stranded Copper wire ONLY in boat.
 

rodsnguns

Recruit
Joined
Jan 18, 2026
Messages
2
I only use stranded Copper wire for battery cables.
NOT Copper coated strands of wire.
Many places sell Copper coated wires.
Engines that take lots of cranking time. WILL WILL cause the non Copper wire to heat up. Reducing the full current to to a lower amount.
Stranded Copper wire ONLY in boat.
Yes that's all I use as well. I prefer the tinned copper. My existing cables look to be the 48 year old originals and I had a bad spot in the positive cable which upon dissecting it , it is just jacketed copper stranded wire, not tinned , and corroded under the insulation. There are no markings on the cables anywhere and that is why I am trying to determine the AWG size so I can replace them. Until I buy a caliper, I have no way to measure the diameter.
 

alldodge

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Mar 8, 2009
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43,665
Use a measuring tape and get a ball park including the jacket. Go to local store and see what comes closest, and can always buy larger
 

dingbat

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Nov 20, 2001
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16,941
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Hard to beat this place for cable quality and price
 
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