The alternator in a Ford Taurus sends electrical current to various accessories in the vehicle while the engine is running. Most modern alternators have a built-in voltage regulator to ensure the voltage level remains constant. If your battery keeps running down or your headlights become dimmer while driving, you may need to replace the alternator.
Determine which alternator your Ford Taurus will need. You'll want to be sure the new alternator is compatible with your Taurus's engine. Models made from 1986 to 1991 have a 2.5 L HSC, 3.0 L Vulcan or 3.8 L engine. The 2.5 L engine was dropped for 1992 to 1995 models, and post-1995 models will have a 3.0 L engine.
Disconnect the negative battery cable with a socket wrench. Release the tension on the accessory drive belt so that you can remove the drive belt from the pulley.
Take off the mounting bolt on the right side of the alternator with a socket wrench and remove the bracket for the power steering hose. Remove the mounting bolts on top of the alternator, the front passenger wheel and tire assembly and the front fender splash shield. Remove the alternator splash shield with a socket wrench and take off the inspection cover for the torque converter.
Mount a tool to hold the flywheel so you can remove the crankshaft pulley bolt and crankshaft pulley. Lower the alternator so you can unplug its electrical connections. Disconnect the crankshaft position sensor and Oxygen sensor connector. Remove the lower alternator mounting bolt and B+ connector nut to remove the alternator.
Install the new alternator assembly by reversing the above procedure. Use a torque wrench to tighten the B+ connector nut to 71 in. lbs. and the lower alternator bolt to 18 foot pounds. Torque the crankshaft pulley bolt to 74. foot pounds, the upper alternator bolts to 18 foot pounds and the nut for the power steering hose bracket to 13 foot pounds.
