Posted by Steve@Advance on November 02, 2014 at 14:01:36 from (107.203.134.67):
In Reply to: ferguson to30 posted by to30man on November 02, 2014 at 08:35:40:
Really need to identify the alternator. If there is only 1 wire on the alternator, either it is a "one wire" alternator that has internal circuitry that makes it work with only the one wire, or it is another type alternator that has had the wires pulled out or was never wired to begin with.
If it is a one wire alternator, there should be 12v to the terminal at all times. Once the engine is started, it should begin charging, up the voltage to about 14 to 15 volts. The connection "window" for the unused connections will still be there, but there won't be any terminals to connect to. This type alternator sometimes will need to be reved quite high to begin charging. Also be sure the belt is not loose or badly worn.
If it is standard alternator, depending on the brand and type there will be other connections. The most commonly used is a Delco 10SI. It will have the large output terminal, 12v all the time, and 2 other terminals, labeled 1 and 2. Terminal 1 will wire to the ignition switch through a resistor, an indicator lamp,or a diode, your choice, the indicator lamp is easiest. Terminal 2 will jump back to the output terminal.
Back to your original question, how to know if it's working... You need a volt meter to check the output. If everything is wired correctly, and it still doesn't charge, there is a problem. Most auto supplies can check them off vehicle. They are repairable if you have a volt/ohm meter. Or trade it for a rebuilt one.
This post was edited by Steve@Advance at 14:07:33 11/02/14 2 times.
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