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Discussion Starter #1
2006 Silverado, did not have original fog lights. I installed the Factory GM Foglight Kit about 1 1/2 years ago, and have not had an issue until now.

Recently one of my HID ballasts for my foglights when bad (Cheap DDM Tuning one), and I decided to replace it with a nice Morimoto Kit from The Retrofit Source. When I installed the new ballasts, the passenger side will not turn on.

Now, this is where it gets tricky. Here is the troubleshooting I have done already:
-Swapped new ballasts with my headlight ones to make sure they were good. They are.
- Swapped bulbs to make sure both bulbs were good. They are.
- Checked for Voltage at the passenger side foglight connector - Yep. 11.5V.
- Checked the grounds. Yep, all good there.
- Swapped Relays, and made no difference.
- Fuse is good.

I even swapped a regular bulb into the passenger side foglight to completely bypass the HIDs, and here is the WEIRD thing that happened... I turned on the foglights with the factory switch, and nothing happened. However after about 15 seconds, the regular bulb turned on but the Drivers Side HID foglight didn't.

I didn't have the Relay Harness installed that I got from TRS, so thinking that maybe the ballasts needed more voltage to fire both at the same time... I installed the harness. This made absolutely NO change at all. Still the Drivers side is the only one that fires.

What else could it be? Any ideas? The only thing left is the switch inside the cab. But could this cause only one foglight to turn on? I wouldn't think so as I believe there is only one power wire that comes down from the relay box, and then splits to each side.

Either way, I'm stumped. Any thoughts are appreciated!
 

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As dumb as this sounds gm uses reverse polarity wiring for the headlights so when you put Hids in them you have to connect the ballast to the truck wiring backwards. Did you check that? I had to go through all that on both my rigs
 

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Discussion Starter #3
Yes I have checked that the power and ground are wired correctly.

Right now I'm leaning towards the switch or a continuity issue with one of the wires in the harness.
 

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So you have power at the factory fog wire?
 

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Discussion Starter #5
Yep, 11.5V to be exact.
 

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Sounds like a problem with the hid either ballast or bulb for that one side
 

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Discussion Starter #7
Nope, when the ballast and bulb are moved to a different location they work perfectly.
 

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Did you try a factory bulb yoo
 

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Discussion Starter #9
Bump - Finally got around to throwing factory bulbs in both housings. Neither will light now. Anybody have any ideas? Foglight and/or headlight switch?
 

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If you have voltage from the power wire at the plug near the fog light housing on driver and passenger side then your problem has to be on the ground side, check for continuity at the ground wire from the plug to the frame of your truck. Imo its a poor ground due to corrosion tho its hard to troubleshoot an issue without actually looking at it good luck i hope this helps
 
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