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My understanding is that batteries work/charge better when they're warm vs. cold.

I mounted a yellow top in place of the stock air box, a red top in stock position (rotated 90 degrees to make room for a second alternator,) an isolator under the windshield cowling, and a four way switch just behind the yellow top. Everything is in the engine compartment.

I have since heard that an isolator doesn't allow the alternator to fully charge a battery, but haven't (heard) any expertise to back it up.

Works great for me so far.
 
bchcky said:
doesn't optima's site specifically recommend against mixing a red and yellow top somewhere?
dunno. I like to switch to the yellow when running winch, converted powered tools with the jeep off, and then back to the red for starting. Haven't had any issues so far and it's been about a year
 
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