How do I figure out why my car windsheild wipers won't work?

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1995 mazda . Car was running fine til all of a sudden the rmp gauge dropped the car would not shift into gear and then suddenly died as I come to a complete stop at a red light. It started fine when I got a jump box attached but died when it was taken off . I had it towed home. The next morning I had it jumped and it started it ran to work then died in the parking lot got it jumped and brought it home. Once home we took the alternator off had it tested it passed 3 times. Put it back on hooked it up and starts fine now but the windsheild wiper control does not work atall and the speed ometer works off and on. Please help I ccan't use the windsheild wipers an in Ohio its always raining