wish i could help, but not sure, although alternators are known to make noises like you explained, my car has an accel coil on it, and i can hear some noises from it, and im about to go with a stock one.
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90 lx coupe: Mac cold air fenderwell, accel supercoil,advncd ignition,3-core radiatr, FMS alum D/S, Black magic fan, 3.27grs, 3chbr flows.
Best time: 13.9116(on 225/60/15 firehawks)
Best mph: 98.17
Best 60': 1.9607
next mods: subframes, mac h-pipe
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