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01-01-2008, 01:00 PM
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Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Tach problem
My tach jumps all over the place at idle when I turn on the heater or AC fan It smooths out as the RPM,s come up. I have it getting power directly from the the fuse box on a separate fuse. I was wondering if the Alt not charging at idle would have anything to do with this. Its a MSD 6A ignition and a stock Tach
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69 Chevy 4x4 383 Power 
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