I had the same problem...my battery was low. Maybe check that! == == Assuming that you were not unlucky enough to get 2 bad replacement units in a row, then 2 things come to mind. There is a broken or chaffed wire in the harness that comes to the alternator. Not the major output wire, but the smaller control wire plug and harness. Also, depending upon whether you have a gauge or only an idiot light - there is this possibility. Some alternators will not start up on their own - the output needs a reference voltage level to make them start to charge. This is often provided by the circuit thru the idiot light which comes on when you 1st turn the key on. If the bulb is gone or a wiring problem occurs here, then the alternator may not kick in as it is designed to do because it has no voltage level to trigger the internal regulator function.
Some vehicles have an external voltage regulator which also controls the warning lamp circuit, some vehicles have a warning lamp relay and others may operate through a computor, all of which require a signal from the alternator. You either have a faulty regulator/relay/computor, A broken signal wire from alternator, alternator is incorrectly wired or a faulty/incorrect type of alternator
This is an easy answer. The alternator is hooked (through wires blue and black) to the battery. So every time you start an engine the alternator kicks on and charges the battery. That's practically how it works. <><><> To add a bit to the above- an alternator produces an alternating electrical current (unlike a generator, which produces a direct current- DC vs AC) On modern cars, the alternator produces the current used to charge the battery, and operate electrical equipment on the car, such as lights, wipers, radio, etc.
Your alternator is NOT putting out enough voltage to keep up with the amount being used. This can be casued by: The belt slipping on the alternator pulley The alternator is going bad. I woudl see if the belt is tight and is NOT slipping. If you haven't bought a new belt lately, its a cheap investment. If the belt is tight and the alternator light stays on, take the car to Autozone or Pep Boys and have it checked while on the car. If you have a multimeter you can check it by seeing how many volts are comign out of the alternator by placing the leads on the alternator to see what current is being generated by it. Anythign less than 12 I would buy a new alternator. Most cars need over 12 volts to 14 volts to operate. Most of my cars run 13-13.9 volts. Also, check the voltage regulator which is located on the fire wall below the left windshield wiper. This a cheap part which often fails on that model.
remove core support and cooling fans. this will allow you room to operate. remove top mounting bolt. slide belt off idler pulley. remove mounting bracket located to the right of the alternator. put a wrench on the nut on the backside of the alternator and a ratchet and 3" extension on the front side. remove the bolt. alternator should be ready to disconnect. to replace reverse the process.
Radiator Fan Doesn't Operate After Alternator ReplacementI suspect that the wiring harness to the Radiator Fan got disturbed inadvertently during the Alternator replacement.This could include a connector plug being pulled loose, a wire cut or broken or "pinched" and thus in contact [grounded] with/to a component of the engine which is grounded.
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