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Ford Aerostar
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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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2005-10-19 01:44:43
2005-10-19 01:44:43

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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most likely its your alternator that's not charging your battery like it should causing it to turn on and off. A good way to check that is by going to your local auto zone and asking them to check your alternator to see if it creating a high enough charge.

The check gauges light comes on when one of the gauges is out of its safe range. It could be the alternator over or under charging, oil pressure low, or the engine overheating.The check gauges light comes on when one of the gauges is out of its safe range. It could be the alternator over or under charging, oil pressure low, or the engine overheating.

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Could be that the alternator is not charging the battery properly Check with a voltmeter A fully charged battery should read around 12.8 without engine running With engine running voltage should read around 13.8-14.2 The most likely cause is a broken alternator drive belt

Is this a Ford? (have had some problems by not using factory rebuilts)Check alternator outputShould read approx. 12.8 without engine runningShould read 13.8-14.2 with engine running

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If the light comes on and its an auto tranny you need may need a new alternator. i had the same problem. the alternator was drawing power from my battery and o i didnt have enough power for my auto tranny

Drive to your nearest Auto Parts store and have them check your charging system. sounds like your alternator may be going bad. Check to make sure it is charging right. The alternator needs to put out atleast 14 amps to suffice for the engine to run properly. Might have a bad alternator.

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