Thread: Alternating current (1 - 1.5 A) in alternator output
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Old 03-31-2013, 11:27 AM
Zushi Zushi is offline
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Alternating current (1 - 1.5 A) in alternator output
Year: 2002
Make: Mazda
Model: Protege5

I've recently been having a look at my charging system, and more specifically my alternator. I've had the alternator tested at a couple places (Autozone & Advanced) and it passed. I will note that for the diode test it said "N/A" and pass on the other two tests. Anyway, I reinstalled the alternator and, using my inductive ammeter, I proceeded to measure the output current of the alternator. At idle I am measuring approx. 12 A (DC) and approx 1-1.5 A (AC). I'm an alternator pro by no means but I do know that the output is rectified from AC to DC. Is there any allowed AC in the output or should there be absolutely none? I also measured voltage between the B+ terminal on the alternator and negative on the battery and I measure 14.15 V (DC) and 0 V (AC)... so there's no AC voltage ripple. Any input is greatly appreciated and I thank everyone in advance for any help!
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