How do you replace the alternator on a 1994 Geo Prizm?

It is built into the alternator. I would just replace the alternator.

It's gotta come out from underneath the car.

1994 Geo Prizm has a timing belt.

how to take off an emissions coil on a 1994 geo prizm

You can change the alternator belt, on your 1994 General Motors vehicle, by loosening the tensioner pulley. The loosened the tensioner pulley will create slack in the belt. Remove the belt and replace with a new belt.

See the related question: How do I replace the water pump on a 1993 Geo Prizm 1.8L?

where is located the oil pressure switch for 94 geo prizm

Disconnect the battery. Unplug the alternator and take the belts off. Unbolt the alternator, and bolt the new one in. Put the belts back on it. Plug it back in and reconnect the battery. Voila! You changed your own alternator!

i reached in through the fender well and changed the bulb that way

No, it is a Toyota engine.

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You may find some help by searching for this question. How do i replace the water pump on a 1993 Geo Prizm 1.8L?

If you are referring to the water inlet hose on the back of the water pump you can use this question as reference. How do i replace the water pump on a 1993 Geo Prizm 1.8L?

Remove the old mount & replace with the new.