- #99 of 103
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Re: 2003 Chevy Trailblazer Headlights Out [frananneb]
by dwr134
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Sep 15, 2009 (6:21 pm)
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Replying to: frananneb (Jun 12, 2009 6:04 pm)
2004 Trailblazer low beams not working (kept going out but would come back on) changed the #45 and #46 relays and lights started working. Will be picking up new relay tommorrow. Thanks!
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- #100 of 103
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Re: 2003 Chevy Trailblazer Headlights Out [pdesimone]
by cwb7266
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Oct 14, 2009 (2:21 pm)
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Replying to: pdesimone (Jul 02, 2007 6:58 am)
Doing research and saw this post. I have the same issue with low beam lights going off and on....However, I have a 2007 TB - was just told by GM dealer that the "entire block" has to be replaced (part $207 and labor $160). I do not have a clue what they are talking about, except its under the seat. Does my car not have the "relays #45 and #46"? Sorry I am ignorant when it comes to cars and I am tired of getting screwed.
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- #101 of 103
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Re: 2005 Trailblazer Headlight Problems [mcarlin]
by keithb5
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Oct 29, 2009 (4:12 pm)
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Replying to: mcarlin (May 21, 2008 11:30 am)
I have the same problem with my 05 Trailblazer. The lights dim because the alternator normally produces 14.5 volts. The battery output is about 12 volts. The voltage drops momentarily when the alternator fails to produce 14.5 volts. I have also noticed the problem during a hard acceleration, which caused me to think it was a slipping serpentine belt. However, the random dimming occurs while driving at a steady speed. Dealer replaced the under-hood fuse block (not the one under the rear seat) as well as the alternator. Neither action fixed the problem. I wonder if it is possible to connect the diagnostic computer and let us drive the cars for a few days with the computer connected.
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- #102 of 103
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Re: Trailblazer head lights going out! [dont437]
by fj4072
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Nov 01, 2009 (10:56 am)
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Replying to: dont437 (Jun 09, 2009 12:08 am)
Your problem is your relay. #46 under the hood. If this happens again, try switching #46 with #45, same relay only for the fan clutch. If they go back on, this is your problem. Autozone has them for $40
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