2 batteries

I don't see any reason to run two batteries in these cars. Nowadays you can buy INCREDIBLY powerful auto batteries, most of which are overkill with most street engines

What engine combo, HP are you running?

AND it's "not the battery" that is needed to run big stereos, fans, etc, it's a larger alternator, and you do NOT want to try that with factory wiring, the factory bulkhead connector, and the factory ammeter

Please READ this article, which details a few of the problems:

Generally,

not a large enough alternator, nor do the factory originals put out enough at lower rpm

not large enough wiring

the bulkhead connector was NEVER designed to carry much amperage

the factory ammeter has it's own problems

http://www.madelectrical.com/electricaltech/amp-gauges.shtml


which came from here:

http://www.madelectrical.com/electrical-tech.shtml