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1986 corvette dash problems

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Old Jun 10, 2025 | 01:10 PM
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Default 1986 corvette dash problems
Anyone had problems with their instrument cluster on a 1986 corvette. Mine shows the voltage running high when it's not and tha dash lights don't always come on at first.
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Old Jun 10, 2025 | 04:38 PM
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Moved to C4 Tech for some assistance.
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Old Jun 10, 2025 | 06:35 PM
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Good luck with the fix
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Old Jun 10, 2025 | 08:15 PM
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How have you determined "voltage running high"? I'd initially check all the grounds and check all solder connections for the display.
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Old Jun 10, 2025 | 08:34 PM
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Welcome!!
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Old Jun 13, 2025 | 10:44 AM
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Originally Posted by CorvetteRules
How have you determined "voltage running high"? I'd initially check all the grounds and check all solder connections for the display.
Check and clean all your connections to the display boards including where the boards connect to one another. The grounding circuits at these connections are bad to corrode.
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Old Jun 13, 2025 | 11:58 AM
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Thank you. Is it very complicated to remove dash to get to these soldering connections. Do I need to take it to a dealer to do or can I do this myself?
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Old Jun 13, 2025 | 03:04 PM
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Originally Posted by Nancymus
Thank you. Is it very complicated to remove dash to get to these soldering connections. Do I need to take it to a dealer to do or can I do this myself?
It does take a little finagling,but you can do it yourself.
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Old Jun 13, 2025 | 03:08 PM
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Somebody correct me if im wrong here.... but I feel I remember reading that the voltage displayed is a calculation/comparison between the input voltage from the car's battery and the voltage output from the instrument cluster's power supply. If my memory is correct, then your ICs power supply is dying.
Last edited by 2011KLR; Jun 13, 2025 at 03:18 PM.
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Old Jun 13, 2025 | 03:19 PM
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The FSM isnt a ton of help....

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Old Jun 14, 2025 | 01:39 AM
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I posted this below in your other post you made on the issue.
Batee has videos and instructions on removal and fixes.

First off, WELCOME TO THE FORUM

This link is a good source that might help. Lots of help information and how to videos too.

https://batee.com/
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