1987 Buick Regal GNX; 89 Firebird - New 120 Amp Alternator (4 O'Clock)

Direct replacement for your worn-out or non-working original alternator. This quality remanufactured alternator will install and function as original.

• 1987 120A 3.8/231-7 turbo

• 1989 120A 3.8/231-7 turbo

Note: Part numbers with a U suffix followed by a number refers to a clock position of the terminal socket on the alternator case. Looking at the back of the alternator with the pivot ear at the bottom, or 6 o'clock position, note the clock position of the terminal socket on your original alternator, and match it to the replacement.

Diagnostic Tips: Here is a simple test you can perform to check your alternator. With your battery fullycharged, start your vehicle.Turn on your lights and heater fan. Perform a voltage test from the positive to the negative battery post. The voltage r eading should be between 13.0 and 15.3 volts.If less than 13.0 volts and your battery connections and alternator belt are good, chances are your alternator needs to be replaced. If the reading is above 15.3 volts, you probably have a bad voltage regulato r (sold separately).