Voltage Regulator Question

Thank you for that nm9stheham...I have the battery - terminal grounded to the trunk floor and no I do not have an inline battery switch. The guy I purchased the car off of prior to all the work I had done on the car already had the battery in the trunk. He did however use 4g wire from the positive terminal of the battery connecting directly to the starter. I have some extra welding cable in my garage...I think its 1/0 gauge. I'll run the welding cable from the battery to the starter and see if I notice a difference before I start changing everything thing else and let you guys know what I come up with.