Question about 1991 Cadillac DeVille
Flickering is not good, and indicates a deteriorating connection of some sort.
The problem is deciding if it is in external power and ground to the dash, or internal to some chip.
Clean all the connections.
Start with the battery terminals, they should be brushed shiny and then greased.
Make sure the engine ground strap and alternator connections are cleaned and greased.
Clean and check the fuses as well, with a test light, because you can't see corrosion enough to reduce current.
It would also be useful to put a voltmeter across the battery and ensure 12.5 volts at idle, and over 14 at high rpm, but not over 14.5 volts.
The next would be the connections to the back of the dash panel, which you reach from underneath. Remember the dash also have one or more ground connections.
If all that does not turn up anything, then I would suggest getting a salvage dash panel.
Posted on Oct 09, 2010
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Posted on Jan 02, 2017
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