Sorry Moparx, yes you are very correct!

Clean sheet metal for grounding my front and rear side marker lights on my Super-bee are a prime example of what you are saying! Still scraping all of the undercoating off under the fenders.

I have 2 Yellow top Optimas’ in my two cars, but current at idle is very important, as I have 150 amp race Powermaster densos’, but current at Idle is 50-55 amps! I need a race denso that puts out around 90-95 amps at Idle. I do have the small Powermaster deep groove alt. Pulley.

One thing I have noticed, is that the discharge rates of these batteries are not even close, and they drain off of each other...I have been keeping a small battery tender plugged in at all times to make sure they are fully charged.

Optima does make a marine deep-cycle battery, but it takes a completely different mount system.

Mark