Have you thought about adding a Cap - to your system to help with the low end voltage problems, having some stored energy might help if it's only during low rpm when the the alternator is not running at consistent speed. Have you changed pulleys on any of them? like added a smaller crank pulley or power steering? sometimes it might provide a lul during the RPM until it passes a cretin point to then speed up? I can't remember there are a few things too you can check using a battery tester, what's the voltage at, should be around 13.5~ 14.7
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