You can't. Buy a new on eBay. They send reprograming instructions with it.
The alternator is mounted low on the back side of the engine.
A 1994 Mercury Villager, also known as a Dodge Caravan, can have its rear hatch removed by detaching the pistons which hold it to the body of the van. The pistons will be held by screws and removing them will allow the hatch to easily come off.
There is no separate switch for it. Pushing the light switch will defeat the dome and courtesy lamps.
i found out how to do it.
It's on the top back corner of the transmission.
Under the car by the back axle.
Turn the key to the right.
Follow the instructions on Youtube.
On the top of the transmission housing at the back corner.
In the ceiling housing for the rear A/C.
Attached to the back side of the throttle body.
Pull the clips back and lift them off.