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2000 Chevy Suburban Headlights

Tiny
DENISE_47
  • MEMBER
  • 2000 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 13,400 MILES
My 2000 Chevy Suburban's low beam headlights won't work. We put new light bulbs in both sides. The High beams work but the low beams don't. Any ideas?
Saturday, September 12th, 2009 AT 11:18 AM

7 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum. My first thought is a problem with the dimmer switch. The dimmer grounds the headlamp circuit. You could use a testlite and check for voltage at the headlamp connector, if you have voltage, the next step is to check the ground circuit.
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Saturday, September 12th, 2009 AT 11:45 AM
Tiny
DENISE_47
  • MEMBER
  • 4 POSTS
We checked the voltage at the headlamp connector and that seems fine. How do I check the ground circuit? I noticed today that my day running lights don't work either. Help!
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Saturday, September 12th, 2009 AT 5:55 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
The yellow wire for the low beam is ground. With the dimmer on low beam, use a testlite connected to voltage, touch the terminal for the yellow wire, if the circuit is grounded, the lite should come on. If it doesn't come on, problem with wiring circuit or dimmer.
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Sunday, September 13th, 2009 AT 8:26 AM
Tiny
DENISE_47
  • MEMBER
  • 4 POSTS
Well.I had to take my car on a quick errand and I thought I would just use the high beams and low and behold I had low beams! It seems that when I tilted the steering wheel, whatever was wrong was now fixed. Could I have a loose or broken wire in the steering column or maybe a loose or broken wire in the dimmer? We checked the ground (yellow wire) and we have voltage there so it seems maybe the problem is not with the voltage.
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Sunday, September 13th, 2009 AT 11:13 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Yeah, something wrong with the wiring circuit or dimmer. Voltage isn't your problem, it's the ground circuit.
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Monday, September 14th, 2009 AT 9:01 AM
Tiny
DENISE_47
  • MEMBER
  • 4 POSTS
How do or even can we check the ground circuit? We should probably just take it into the shop but I'm afraid it will cost an arm and a leg to get it fixed. Anyway, I want to thank you for all your help. I really didn't think I would get any response. Can I still make a small donation, if so how do I do it?
Thanks again, Denise
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Monday, September 14th, 2009 AT 9:42 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Yellow wire is ground, unplug low beam connector on both left and right low beam lamps. You have to unplug both because they share the same ground, then, there should be no voltage on the yellow wire. Use a testlite, one end connected to battery voltage, the other end of testlite touch to the terminal for the yellow wire, the dimmer needs to be on low beam, if the lite comes on, the ground is ok.

As far as a donation, you can scroll down the page, where the messages are located, there is a link for donations, you use a credit card. Thanks for the donation, even though I didn't help much. I tried to post a link for the donation, I'm not sure it worked. Thanks again.

Make a small donation! My link didn't work.
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Monday, September 14th, 2009 AT 10:52 AM

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