[GT182]

This is by Vic(6D6GOAT) dated 03-30-08 in the old thread on this subject and using a relay. I don't think it's for Daytime Running Lights tho. It's actually for accidentally leaving your lights on and with the relay they automatically go off. Like today's auto shutoff for lights.

"pretty simple really. i just bought a relay at the parts store...you know the ones with a 30, 87, 87a, 86 and 85 numbered terminals.
i just cut the large red wire with a white stripe at the headlight switch.

the red/white wire coming out of the headlight goes to the #87 terminal (use an extension of the same gauge wire. that way the relay is easier to get to if it fails)

the other end of the red white stripe wire coming from like the firewall area goes to the #30 terminal.

the #85 terminal goes to a ground

the #86 terminal goes to a 12V source when the ignition is ON only. i used a male terminal at the fuse block. (the most lower right corner, just above the fuse box mounting bolt)

the 87a terminal doesn't get used.

basically, when you turn on your ignition the 12 volts sent to the #86 terminal closes (connects) the red/white stripe wire that you cut sending power to turn your headlights turning them on ONLY when you have your headlight switch pulled to the on position. if you have the headlight switch pushed in your lights will be off....and if you accidentally leave your lights on...when you turn your car off the relay will open (disconnect) the red/white wire cutting the power to your headlights. then when you go back and start your car your headlights will come on....geez, i hope im not mastering the obvious with you guys.

i keep an extra relay in my center console. they are under 5 bucks. i have been running the same relay for years now with no problem. im not sure how many times it has saved my battery but i know it has.

i hope that helps."