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Old 08-29-2011, 07:25 PM
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testing headlight switch?

Ive had HID headlights and fogs in my truck for about a year now and the other day both of my fogs quit at precisely the same moment. I checked all fuses and would like to now check the switch before I move onto getting into warranty BS on the bulbs and ballast. Does anybody know how I would go about testing the switch?
Thanks in advance
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Old 08-30-2011, 04:54 AM
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If you still have the old bulbs I'd just unplug the factory harness from the ballast and re-plug into the old fog-light harness, effectively bypassing the HIDs. If your fogs illuminate you have eliminated the switch.
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Old 08-31-2011, 09:54 PM
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put in old bulbs and still got nothing. Anybody have any advice is there a relay I can check. I find it hard to believe that my switch or wiring got burnt out before the fuse.
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Old 09-01-2011, 06:12 AM
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I've seen a schematic for that part of the electrical system before but I don't have a copy of it. I'll see if I have it on my home PC tonight. But to be honest, I am pretty positive there is no relay in that system. The switch and wiring carry the full current load.

Does your switch illuminate when you turn on the headlights? If not, you probably toasted it. If you have a decent multi-meter, just check for continuity across the pins with it in the foglight "on" and "off" positions.
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