According to the wiring diagram above there are 2 white wires (denoted by a W in the diagram) coming out of the Alternator. Both go to the Battery. Then there is a White/Red wire that goes tot he "Engine Room Harness".
Again, make sure that the Black wire (ground) is making good contact to the body chassis (bolt is on tight). Try removing it and cleaning up the contact with a wire brush.
Also you can have your alternator tested, it may be putting out a bad voltage.
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