another dumb question. i have a 41 1/2 ton with a 54 235. i'm converting to 12 volts and i'm looking for a 12v voltage regulator. i was looking at autozone's vr602 and vr1261. both say they will keep voltage between 13.5 and 14.5 but don't specifically say they're for 12 volt systems. will one work better? should i look elsewhere? thanks, joe