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Old 09-17-2015, 08:12 AM   #1
dpetteng
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Dash light?

So I recently purchased my 1972 C10.

Last night I drove it for the first time in the dark and when I switched the lights on a red warning light came on at the top of the speedometer. I also noticed no headlights, I went over a bump and the lights came on and the warning light went off but was intermittent through my journey.

Any ideas?
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Old 09-17-2015, 08:36 AM   #2
cdowns
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Re: Dash light?

check the plug on the dimmer switch on the floor// the red warning light was probally the indicator that the high beams were on
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Old 09-17-2015, 09:01 AM   #3
dpetteng
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Re: Dash light?

If that was the case the lights would still be on, right?
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Old 09-17-2015, 09:05 AM   #4
dpetteng
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Re: Dash light?

Does anyone have a diagram telling me what each of the warning lights are? My owners manual doesn't tell me LOL
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Old 09-17-2015, 09:55 PM   #5
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Re: Dash light?

Quote:
Originally Posted by dpetteng View Post
So I recently purchased my 1972 C10.

Last night I drove it for the first time in the dark and when I switched the lights on a red warning light came on at the top of the speedometer. I also noticed no headlights, I went over a bump and the lights came on and the warning light went off but was intermittent through my journey.

Any ideas?
Your Hi-beam light is tied in with the light green wire on the dimmer switch. like CDowns said, the dimmer switch may be bad or making a loose connection inside. You'll probably find a lot of corrosion in the plug also.

The warning light is on top of the speedometer as you know.
Check the diagram below.The green wire runs to terminal 11 on the cluster plug and the copper strip runs from there to the hi-beam light.

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The 12 gauge blue wire is the power wire for the headlights and the dimmer switch makes contact with the light green wire for hi-beams and the tan wire for low beams.
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Old 09-18-2015, 07:46 AM   #6
special-K
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Re: Dash light?

Sounds like a loose connection at the dimmer or a bad dimmer. A bad electrical part, or loose connection, can act up intermittently. When the dimmer goes bad it often only works on dim since that is the portion it is left in most all the time. It could be corrosion due to the hi-beam side left open for so long. Do the lights work at all on hi-beam? The switches are cheap enough. It sounds like time for one of those, but check connections first
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Old 09-18-2015, 01:27 PM   #7
Phildeez
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Re: Dash light?

Similar issue I've had. I had the high beams on, hit a dip and lost the driver side headlight. I hit the dimmer switch and both lights began to work. I pulled over and found the plug at the lamp itself was the problem. Gave it a little push and the high beams have been working since.
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Old 09-18-2015, 02:19 PM   #8
leftybass209
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Re: Dash light?

That foot mounted dimmer switch can take a beating! Looks like you're in good hands with those who've already commented. I don't have much to offer other than I had similar issues and it was indeed, the dimmer switch.

Best of luck!
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