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There are times when the alternator will test out fine as far as amp output and voltage output but if your alternator has a weak diode(s) it may trigger the light to go on. I hate to say you should replace the alternator, but your charging system is pretty much self contained in your alternator so I believe the problem is in fact in your alternator. Good luck.

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โˆ™ 2005-10-19 01:44:43
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Q: 93 Ford Aerostar alternator light is on you had the alternator check and it comes out good what else should you check?
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