2006 C4500 No headlight issue - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 09-30-2019, 07:15 PM   #1 (permalink)
Mrcar1955
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2006 C4500 No headlight issue

Hoping someone can help before I pull more hair out.


2006 C4500 Monroe conversion.


No headlight functions. High beam indicator stays on all the time when truck is running. With truck off, headlight switch to on causes the highbeam indicator to come on, no headlights operate, the fan blower in the cab comes on, and the suspension compressor will sometimes try to run.


Disconnect the c126 connector at the frame rail and the high beam switch, DRL, and fan blower seem to function normally.


I replaced the headlight switch and the symptoms persist. Checked the grounds with a multimeter and all seem good.


Help!

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Old 09-30-2019, 09:29 PM   #2 (permalink)
Zippy76
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I have an 09 C5500 4x4 and I've had some weird headlight problems too. I actually pulled the fuse for the DRL'S (daytime running lamps) and all my issues went away. Not too sure if you have DRL'S but give it a shot if you do.

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Old 09-30-2019, 09:34 PM   #3 (permalink)
Zippy76
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Also check actual your high beam switch in your steering coulmn. Could have a cracked positive wire touching ground. I believe you can just unplug the high beam switch altogether. It's located on theower part of the steering column.
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Old 10-01-2019, 08:17 AM   #4 (permalink)
Mrcar1955
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Iíll try both of those tonight and let you know what I find. Thanks.
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Old 10-01-2019, 10:43 PM   #5 (permalink)
Mrcar1955
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Fixed it. It ended up being a bad ground.

About halfway back on the passenger side frame rail is a ground junction box. It takes one ground wire and distributes it to 3 locations (has provisions for six grounds).

I think since it sits up in the frame rail it collects water and junk which caused the ground connection to go bad.

To others, start here first with any weird electrical issues.

Thanks for the input. Hope this saves someone else a few hours of troubleshooting!
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Old 10-02-2019, 02:16 AM   #6 (permalink)
davester
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thanks for following up with what the fix turned out to be. good stuff.
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