If you bought a refurb alternator it could be bad out of the box. It has been known to happen, also check all fuses and relays in fuse box and or engine bay depending on car type. Your battery might also be the problem, or a short in the wiring.
SOURCE: 1990 Ford Aerostar Altenator
check the relays in the engine compartment fuse panel... locate the one for the alternator and replace it and see if that fixes it.... short answer to your question... yes they can be bad right out of the box... very frustrating to say the least
SOURCE: 81 bronco, 351w. alternator is creating charge,
Possibly the new voltage reg is bad, it does happen. Check and make sure all wires are connected to the back of the alternator, and on tight. Check battery cables and make sure they are on tight, and not corroded. There may be a ground wire on the alternator that needs to be on it, or grounded to the motor or body.
SOURCE: Will not charge battery, altenator and regulator
is the battery light on with the key on, engine off? if not.... it should be. if not, one of the small wires is the ground for the bulb. if the bulb is burned out, it wont charge....The large wire should have 12volts. What is the voltage at the battery when running?
SOURCE: i replaced the altenator and voltage regulator in
alternators need current imput to generate current. Check if there is current coming to the connector atatching to the alternator socket. If there is no current, check the "alt" fuse or wiring. Charlie
Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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