Hi there,
This is quite correct a faulty diode will cause this problem and the alternator will still charge but at a slightly reduced rate, the quick check is to place an Amp meter between bat pos and the cable note the current draw, then unplug the alternator and see if it drips, if so I would suspect a faulty diode, the main test is to dismantle the alt and do a continuity check on each diode, if current flows in doth directions the diode is faulty.
Mark (mhpautos)
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Thursday, November 5th, 2009 AT 3:45 PM