Was wondering if anyone else has has this problem. I checked my battery and alternator and battery tested bad, and alternator tested good but had a 70mv ripple. I replaced both and I still get the same test results with new parts. Ac Delco battery and Remy alt. What could be causing the excessive ripple?
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88 e30 M20 excessive alternator ripple.
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70mv at idle doesn't seem particularly high to me. Peak- to- peak, or RMS?
It just depends on how many poles swing by how many loops in the field coil how fast...
and a whole bunch of physics in the metals...
If it did it with just one alt, I'd say check for a dead diode/coil/etc in the field.
But a sample of 2 is pretty conclusive.
tnow, sometimes I just mess with people. It's more entertaining that way. george graves
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