Re: alternator light comes when car slows to a stop
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.
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have a load test done on the battery for failing cell and have the output of the alternator checked as if the battery is faulty then the alternator has trouble supplying enough current to run every thing electrical
That would be an indication your alternator may be having issues (or the battery with storing power). The light is basically connected to the +12 output from the alternator and the +12 post of the battery. When there's enough voltage difference between the two, the light will glow. I recommend getting your battery and alternator tested at a place such as advance auto and see which is causing the issue
sounds like you alternator has a low voltage output at idol to be sure of this take you car to any auto parts store and have them perform a on car alternator test that should confirm my suspicion of the alternator
This is common on this nissan when the alternator goes bad it will turn on these lights and sometimes even more dash lights will come on, check and make sure the belt is on the alternator and didnt come off next check the battery connections and the connections at alternator. have the charging system tested, this is a quick test and will test the battery and alternator and starter, you will see that the alternator is not charging good and need to be replaced, take note that when the battery drains down the car will stop running and you will be stuck out on the road, it sounds like its on its way out , good luck, hope this is helpful.
The little house light means your coolant level is low. Dangerously low. The squeeling sound with the battery light coming on means that either your alternator is about to or has already died or your alternator belt needs to be tightened or replaced.
Take it into Autozone or O'Reilys or NAPA and have them to a free diagnostic check for you to see if the batter and alternator are ok. We can proceed from there.
When at idle the RPMs drop as the engine slows. This results in the alternator slowing. If it is failing or you have a problem with the charging system it can cause the car to die.
Usually however with a charge failure it will not start back again easily.
Try checking under full load. Run all electrical systems radio, heater, lights etc at idle. If you see the lights start to fade and the engine dies it is likely the charging system.
Most likely the alternator or part of the regulating system.
You can have the alternator tested or you can do it yourself.
Connect at voltage tester to the terminals on the alternator. Run the engine and measure the output. It should read as per the indications on the alternator. There is a sticker on the alternator telling you the output.
I'm guessing that you've tested the actual current output of the alternator then. I'm assuming that the output is between 13-14Volts at the battery when the car is running... If it's too low, then it's not charging your battery at all, too high, and it's frying your battery.... Another thing that can cause this is if you have a short in your electrical system.. that, however, will be difficult to narrow down...