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 Motor to Battery-What Gauge Wire?		  New Topic  Topic Locked
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CateP
Navigator

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USA
108 Posts
Initially Posted - 05/24/2013 :  08:58:11  Show Profile
Hi Fellow Catalina-25 Sailors,
I have to replace the wires going from my motor electric start junction box to the battery. I am wondering what gauge wire I should use? The span runs under the aft berth to the battery compartment under the starboard settee in the cabin. I'm thinking about 10ft.?

BTW_The junction box I refer to is a something I made to connect the electric start wires from the motor to the wire cable running to the battery.There are bolt posts with nuts.
"Mysterious" 1983 C25 SR/SK #3655
Lake Winnipesaukee, NH
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 05/24/2013 :  09:25:33  Show Profile  Visit delliottg's Homepage
Cate,
The wire gauge will depend on the load (in amps) that it'll be carrying. In general bigger (smaller number gauge) is better. Longer runs require thicker wire. You should be able to figure out what your starting amperage is from your outboard's manual, or failing that, borrow a clamp-on ammeter from your local car parts store & get an actual reading. From there you can use [url="http://www.bluesea.com/articles/1437"]this table[/url] to help figure out what gauge you need for your run.

I don't think I'd use anything of lesser diameter than 8 gauge multi-stranded marine grade wire, and would probably choose 6 or 4 gauge, especially since the cost isn't going to be great with that short of a run.
Edited by - delliottg on 05/24/2013 09:27:30
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.