Quote:
Originally Posted by Steve Gallegos
Tach- at running speed when tach should be at 2500 it vacillates between 2000 and 3000. if at 3000 goes between 2000 and 4000. then stops for awhile then does it again.
Speedo- will be running steady at 60mph then swings down to 20mph then up to 100 back to 20 then will steady out. does this periodically.
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Mine used to fluctuate as well, but that went away when I replaced my Ford large frame 1G alternator with a Ford 3G alternator. I don't know whether I had a bad alternator diode, bad grounds, poor wire connections or a flaky voltage regulator, but the problems all disappeared after changing the alternator and re-wiring for the 3G and its internal voltage regulator.