1995 Pontiac Bonneville Q&A

1995 Pontiac Bonneville Question: charging issue

charging system reves up and down, lighst go up and down, car starts ok, changed the alternator, and battery, did not fix the problem. Battery indecator guage stays in the low area, goes about half way up then back down then back up then back down, What else can I try to fix this ??? -
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