Website: https://www.brotherstrucks.com/ Complete step-by-step process on installing the original factory Dual Battery Option on your 67-72 Chevrolet or GMC Pickup. Dave Welch is a classic truck Specialist and he's got plenty of tricks for nearly every project on your classic! Find Dave's videos and more for your classic at www.brotherstrucks.com Parts used: Dual Battery Kit: https://bit.ly/39IEYjG