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Old 06-27-2023   #1
rufcar
 
Join Date: Mar 2023
Location: PA
Posts: 52
Default Speedo light on start up immediately goes out? 1990

I only have my car about 2 months now and I have repaired everything that was not correct or that bother me. I notice that on start up in my garage the speedo light come on for a few seconds and goes out. Once I drive out of the garage into day light it goes back on! Shouldn't it be on all the time when the engine is running?
I also notice that now that I re-grounded both frame sensors the dash lights are a bit brighter and no longer blink!

Last edited by rufcar; 06-29-2023 at 09:23 AM.
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Old 06-28-2023   #2
-=Jeff=-
 
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Location: Bartlett, IL
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Default Re: Speedo light on start up immediately goes out?

What year car?
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1990 Corvette ZR-1 #1051
Watson Headers (2" Primary) - Borla Catback
Late Model IH - Plenum
Coilovers - 4.10s
Custom Interior
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Old 06-29-2023   #3
rufcar
 
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Default Re: Speedo light on start up immediately goes out?

Thought I typed that 1990 zr1 sorry
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Old 06-29-2023   #4
-=Jeff=-
 
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Default Re: Speedo light on start up immediately goes out?

I believe the dark LCD is normal on a 1990 LCD.. 1991-newer they changed how the backlighting works. I ended up swapping in a 1991 CCM to get the brighter backlight.

Marc Haibeck has another solution to the backlight for the 1990 as well
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1990 Corvette ZR-1 #1051
Watson Headers (2" Primary) - Borla Catback
Late Model IH - Plenum
Coilovers - 4.10s
Custom Interior
NCM Lifetime Member #978
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Old 06-29-2023   #5
rufcar
 
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Default Re: Speedo light on start up immediately goes out?

Tkx I will look into both. J
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Old 06-29-2023   #6
rufcar
 
Join Date: Mar 2023
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Default Re: Speedo light on start up immediately goes out?

Quote:
Originally Posted by -=Jeff=- View Post
I believe the dark LCD is normal on a 1990 LCD.. 1991-newer they changed how the backlighting works. I ended up swapping in a 1991 CCM to get the brighter backlight.

Marc Haibeck has another solution to the backlight for the 1990 as well
Spoke to Marc Haibeck today. Tells me its a common problem with the 90s. He wires in a diode in the line to lift the amount of dimming for in garage and tunnel driving . Or do-nothing since those are the only times it's dim. Jim
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