This just happened to us, and it was the alternator ... try finding a good price on alternators for a discontinued model :/
Probably the alternator, battery or maybe you have a short somewhere, also check the fuses, some auto parts check for free.
Or if their is a good auto-electrical repair shot in town you can often get it rebuilt for fairly cheap.
Well found out the problem, was a short in the battery connection
Loose contact in the wires connected to the light...
Ur welcome ssl