I had similar problems, check the floor mounted dimmer switch. Mine was corroded to hell and all the problems dissappeared when it was replaced. I also added an extra ground wire from a bolt on the back of the dash cluster to the dash itself, but it was the switch that cured the problems.
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Phil
'67 C10 long fleet.
350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon
2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission
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