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If it makes a loud whining, screaming, or grinding noise, it needs to be replaced. Before you do, verify that it is indeed your alternator and not a pulley or other engine component If you suspect low output is why it's bad, the only way to verify that your alternator is bad is to attach a diagnostics tool, or remove it and take it to a local automotive parts store. Most will bench test your alternator for free.
What else can I help you with?
1995 Cadillac alternator overcharging?
Voltage regulator built into the Altinator is bad. Replace voltage reg or whole altinator
Why are the headlights dim and flickering on 1997 Chevy Suburban?
altinator going bad
How do you loosen the tension on the belt for the altinator?
how do u lossen the altinator belt on a 91 honda accord
Does a Yamaha badger have altinator?
no they have a stator
How do you remove an alternator from 1995 eagle talon?
first romove the altinator belt then from under the car detach the altinator harness connectors then remove the lower bracket then remove the adjusting bolt then last remove the bolts and take the altinator out it might be a little tight but it will come out from under the car
What must be done when a 1992 Lexus sc300 wont keep charge after altinator change What is the problem?
Bad battery? Could be the wiring harness in the charging system. If the replacement alternator was a used part, it might also be bad (yes this has happened to me).
Why does the clock light blink on with the second or third depression of the brake then go off until the car moves again under power in a 1994 Nissan Altima?
It could possibly be bad ground wires or weak altinator or bad voltage from your battery.
Should your battery light be on after having a new battery and altinator?
No
Why won't Taurus battery keep a charge?
eather the battery has a dead cell or if it is farly new and was dead for a period of time in the winter will kill the battery and cause it not to charge.... or it could be the altinator that is bad and not charging
How do you loosen alternator on a 1983 Plymouth reliant?
how do I loosen and adjust altinator
When the engine is not running current to operate electrical circuits is supplied by what?
altinator
How do you change an alternator belt on a 1985 impala?
loosen altinator, loosen smog pump, take smog pump belt loose, then take altinator belt over smog pump belt and over fan
