1998 Dodge Caravan

My parents have a 98 Caravan that runs and drives great and then all of a sudden things stop working, like all the guages go off, or the windows will not work, or the alarm will sound, or when they turn off the ignition it will not start, like it has no battery. They have already replace the battery, alternator and starter. Sometimes if they lock & unlock the door with the key several times it will start. A mechanic told my mom not to use the remote anymore.I would appreciate any help or suggestions that you have.
Thank you for reading about the problem.
November 13, 2007.

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