Originally Posted by Stanton
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Now if one was just a starting battery and the other handled the rest of the electrics, then yes.


Yes. that's the idea. EFI wiring can be problematic if not done with dedicated +/- so my thought is two separate circuits. I wouldn't even ground the EFI system to the body, I'd use +/- buss bars. Only the starting and accessory circuits would be grounded to the body.


That seems unnecessarily complex. I can't think of any factory EFI setup like that and I sure am not doing that with the microsquirt EFI setup for my 51 Plymouth, If you are worried about some noise on the line messing up your computer, you can add filters to deal with that on the main feed to the computer as well as making sure you have good, clean grounds done in accordance with your EFI supplier's directions.