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I did a search but didn't see any info on a Dual Battery set-up. I know I need two batteries, but what else do I need to make it work?
 

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I don't think you must have an isolator. You could just run 2 batteries in parallel. Ideally, they should be identical to get the best load sharing.

I'm positive I've seen dual battery diesels with them just connected together in parallel to double the capability.

The isolator is to isolate the batteries so a drain on one battery won't deaden the other one. This then gives you a reserve battery to start the motor.

Peter
 
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