How do you replace the alternator on a 1994 Ford Ranger?

You will need a large adjustable wrench for the belt tensioner and a sized wrench to take off the three bolts of the actuator. Disconnect the battery wires at the battery, no need to try and shock you. Use the large wrench to pull back the self adjusting belt tensioner arm holding the main belt. The arm is on a spring and just needs to be moved to release the tension on the belt so you can take the belt off the alternator. Take out the three bolts holding the alternator in. Remove the wire harness and ground going to the alternator and exchange with new alternator. Repeat instructions in reverse to put the new alternator back in.