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A free wiring diagram for this car can be found in its maintenance manual. It can also be obtained through an auto tech at an auto store.
yes
Under your hood there should be a diagram. a sticker on top of the radiator...in that area. If not you could probubly google "Belt diagram for 1998 buick regal" image search. make sure you get the right diagram for you motor.
A free vacuum diagram for a 1996 Buick Regal can be found in its manual. It can also be obtained at an auto part store, as a print off.
autozone.com
If you get the PCM, engine wiring harness, and intake manifold from the Regal also..
Spark plug diagram for '98 buck regal
Disconnect the 1990 Regal battery. Remove the alternator belt. Unhook the wiring from the alternator then unbolt it. Remove and replace the alternator then reconnect the wiring, belt, and reconnect the battery to finish the installation.
There is a wiring harness most everywhere you look on that and any vehicle. Be more specific.
Disconnect the Regal battery. Remove the alternator belt. Disconnect the alternators wiring, then unbolt and remove the alternator. Reverse the procedures for installation.
Disconnect the battery, then remove the alternator belt on the Regal. Unhook the alternator wiring and bolts, then remove it. Installation of the new unit is reverse of the procedures.
With proper maintenance probably forever