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I have a 2006 duramax 2500. While driving, one of my lowbeam lights went out. I replaced the bulb but it still didn't work. I checked the fuse and the fuse is fine as well. I was told that the dimmer switch on the steering column might be the problem. I haven't been able to find a wiring diagram to check for a short in the wiring. I thought I might check the wiring before I buy a new switch. Any ideas?

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    Just to be sure, try changing the bulbs left/right. You never know if you didn't get a bad bulb. – Pᴀᴜʟsᴛᴇʀ2 Dec 31 '16 at 23:40
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    Inspect the socket for corrosion too. – Criggie Dec 31 '16 at 23:41
  • What did u figure out I'm having the same problem – Austin Jun 2 '17 at 11:46
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I don’t have a wiring diagram but it would seem that your dimmer switch would be common to both headlites. Best to start at the problem, i.e. the nonworking bulb, and trace back from there for voltage.

  • Keep in mind that headlights draw a substantial amperage. There's a relay box that takes the light duty signal from the switch and closes a rather high amp to the lights proper. – TomO Jun 3 '17 at 22:46

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