Headlights and Relays

[Andy4639]

I've had mine in the truck for over a year with no problems. I wired them in myself and made my own connections. The lights are relays aren't the question here. It's the how to do it and why.

You want as much voltage and amps to the light that you can get from the battery and you don't want them dropping out in either one while driving.
So you add a straight wire that will carry the load of both the high beams being on from the battery to the relay. Then you use the old wires from the factory head lights to turn the relay on.
On a Chevy truck one relay per low/high beam light is enough. Once you have the relays in place the head light switch hardly see any amps and will last forever. You now have less load on the entire electrical system in the truck because of the relays. Your whole wiring system will thank you.
As for a GMC they are no differant except they have more connections.
2 relays will be enough.