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Longhorn Man · 01-20-2006, 10:46 PM

Unplug the dimmer switch. Take a jumper wire anmd jump from the one terminal that is alone, to one of the two that are side by side, see what lights light up. Then from the one single terminal, to the one remaining terminal, check out the lights again.
If they work the exact same way they are working right now, then your switch is fine. Then you'll need to keep looking. Another prime problem area is the plugs on the back of the lights... unplug them and look at them real carefully, look for green corrosion, rust, or the terminal missing all together.

01-20-2006, 10:46 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: GMC Headlight ? Unplug the dimmer switch. Take a jumper wire anmd jump from the one terminal that is alone, to one of the two that are side by side, see what lights light up. Then from the one single terminal, to the one remaining terminal, check out the lights again. If they work the exact same way they are working right now, then your switch is fine. Then you'll need to keep looking. Another prime problem area is the plugs on the back of the lights... unplug them and look at them real carefully, look for green corrosion, rust, or the terminal missing all together.