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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1685
Experience:  GM Grand Master Technician 2007. 14 year experience.
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Was wondering what i need 1991 GMC Vandura G2500, i have

Customer Question

Hello sir, was wondering what i need for my 1991 GMC Vandura G2500, i have bought a Led/Halogen Headlights and the old wire harness is not keeping up with it and burning up when used in brights, so low beam only. What do i need to buy to make a modern headlight harness and the instructions to do so and was wondering, if replacing the Passenger window switch might fix why it won't go up or down, used too though. Thanks kyle
Submitted: 1 year ago.
Category: GMC
Expert:  tripletauto replied 1 year ago.


What you need to do is run a relay and have your existing high beam power wire cut the relay on. running bigger power supply wiring to and fom the relay. this will be able to handle the load here is a basic relay wiring picture. you will not need the toggle switch as this will be the high beam wire.