68-72 GMC Truck Forward Lamp Harness, w/ Factory Gauges, Internal Regulated Alternator on Driver Side #

68-72 GMC Truck Forward Lamp Harness, w/ Factory Gauges, #39125 For Internal Regulated Alternator on Drivers Side Electrical circuit from voltage regulator, horn relay, alternator/generator, headlights, and park lights, where applicable. Most V8s with short water pumps mount alternator on drivers side. Most V8s with long water pumps mount alternator on passengers side.