One dim headlight

[David Proske]

I have the KD light harness and rally bulbs on my 03 GMC. Its amazing how much light this provides versus most other vehicles on the road.

Anyway while following a friend home the oher night she informed me that my headlights are way too bright tongue.gif and that the drivers side is less bright. I said WTF and looked sure enuf, the drivers side HI AND LO is more dim than passanger side.

I have grounded both sides to the fender bolts on the lip of the fender in the front. I cleaned these connections and applied dialectric grease. No change. Do i need to run an extra ground whire on the drivers side? If so where?

[Modified]

I'm sure you have a poor ground if both driverside lights are dim. Do you have a OHM Meter handy, to prove you have a good ground? Be sure you are not connecting ground to the painted or undercoated frame.
For my truck, I mounted the relays to the firewall, behind the underhood fuse block. It looks like I found a ground under the fuse block cover. My harness is then routed under radiator to the passenger side, and I used the passenger side horn mount for the second ground.
To prove it's a ground, temporarily run an extra wire from this headlight harness ground wire, to the battery negative, and things should work OK.
If you scrap surface, down to clean metal, it will probable work.

[FirstDiesel]

Had similar issues and found the ground was just not good enough. Make sure you have a really good ground. To test and see if the ground is really your problem just take a length of wire stripped on each end and touch 1 end to the ground block at the engine and the other end to your ground connector ring and see if it makes the lights get brighter.

[Kennedy]

The ground lugs are soldered in, but I have had an occasional case where the wires made poor contact.

I'd start by ohming the ring eyes to battery - and work back from there...

[DMAX Daddy]

Check resistance from the soldered connector to the ground on the battery. If its not below 1 or 2 ohms thats the problem.

I had the same thing happen, but my right hand ground got a tad loose. Once I tightened it up it was fine. Now I check them out of habit every time I open the hood.