1963-1966 Forward Lamp Wire Harness – GM Truck With Warning Lights -This wire harness starts at the drivers side firewall connector and runs down the left front fender and across the radiator support. this harness connects to: the alternator/generator, voltage regulator, horn, the headlight extension harness, and the battery. all of tuckers wire harnesses are made with the original blueprints, original connectors, and original color wire. this helps to assemle your truck’s wire harness per the factorywire diagram. the best thing about our hanresses are, they are made in u.s.a.!