Didn't want to further hijack another topic with my question which wasn't answered clearly...12V negative ground 3020 gas with 2 batteries (TSC specials-about 470 CCA each). I have the right side positive hooked up to the left side positive and that connects to the solenoid. Interesting question is to connect each of the batteries positive terminals to the solenoid.
Will the engine turn over faster? That would be a help this time of year.