Quote:
Originally posted by andrew15
Any other ideas
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What I'm searching for in your car is voltage noise or voltage spiking. So my latest bright idea before alternator removal is to completely remove the hot feed wire from the tach. Run a feed wire directly from the battery to the tach. This should remove an unwanted prob from the feed wiring. If you do this test? Check for AC ripple First. It should be done directly at the alt but try a battery test anyway. Hook up a meter. Set the meter to read less than 1 volt AC. A reading .2v AC, maybe .1v, is the limit your alternator should read.
I've never had this prob. I'm assuming we're searching for a non routine and oddball problem.. meaning maybe the ignition sw feed to the tach is dirty from the sw or another system is also attached to the tach feed causing problems. I'm hoping the battery feed would by-pass a dirty feed or buffer the prob. good luck.
ps: check AC ripple with engine operating