Although a dead battery often means that your battery needs replacing, on occasion, it means there are bigger problems with the charging system. The alternator provides power to the battery and electrical accessories, and if it goes out, then the battery will eventually die as well. The fix is to replace the alternator on your 2002 Chrysler Voyager, but first you have to remove the old one.
Pop the bonnet and locate the alternator on the driver's side of the engine, at the very top. Loosen bolts on the alternator with an open-end wrench and 3/8-inch ratchet and socket. Then tilt the alternator toward the middle of the engine and remove the belt from the alternator pulley on the engine.
Remove the negative connection on the top of the battery with an open-end wrench. Once that's off, do the same with the positive connection. Remove any connections on the back of the alternator with an open-end wrench.
Unbolt the alternator from the engine with the 3/8-inch ratchet and socket and then lift it out of the engine compartment.