Question about 1993 Honda Accord

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Alternator light comes when car slows to a stop

Alternator light comes on sometimes when car slows to a stop.

Posted by jancooper4 on


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Three possible causes: bad alternator, loose fan belt, or idle speed too low.

The most likely cause is a bad alternator (that is one or more of the components therein such as a diode). But I have found that instead of trying to fix one, it is easier to go to an auto store like NAPA and buy a replacement (probably rebuilt) for about $100. If you plan to keep the car, get one of the more expensive units if you have a choice. Some come with life time warranties.

Another possible cause is loose drive belt. I am not sure what kind of belt drives the alternator on a 93 Honda, but if the drive belt is loose, tighten it (if that is possible). (On older cars, this is possible, but you may have a serpentine belt with "tensioner" which is not easy to adjust the tension.) On most belts, there should be no more than a quarter inch movement if you press the belt with your fingers (hard) between any two pulleys. If more than a quarter inch slack, then the belt could slip under load.

Least likely is very low engine idle speed, say 500RPM. This could result in light coming on because the alternator is not turning fast enough with such a low engine speed. But if the engine idles smoothly and doesn't lope, that's probably not the problem.

Posted on Oct 16, 2009



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Replace the alternator.

Posted on Oct 16, 2009


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