I installed HID lights on my vette about a year ago. They worked fine until recently. Now when I turn my headlight switch off, the lights go down but remain on. What do I need to fix this. Is it the headlight module or switch? Help!

 

Found the problem. Relay had water in it and rusted shut. New Relay---OK

 

glad you fixed your problem. a while back I had water intrusion into a relay which caused non-street legal lights to turn on when I didn't want them on, or know about it! gotta be careful about that. good thing there were no cops around!

unless your relay says that its waterproof, waterproof it anyway! wrapping in electrical tape is usually not good enough for a relay because the tape will fall off. I usually seal the seams of the relay, where you can see and pry it apart if you need to, with silicone to keep the relay itself water tight. then I usually use spade connectors on the relay terminals instead of a plug, wrap it up in electrical tape leaving a hole in the bottom, then fill that entire cavity (between the spade terminals) with silicone, this makes it 100% water tight. if I ever need to remove, replace, or change the wiring on that relay, cut the tape off then pull the silicone out with a pair of needle nose pliers, it actually comes back off surprisingly easily if needed.

I've fallen victim to my own complacency a couple of times when it comes to water in the electronics under the hood or behind the rear tail lights. unless its inside the cabin I protect anything I add to my car as if its going to be submerged in water, that way I know everything will work and will continue to work for years to come. clear silicone is your best friend for this!