Sounds like the single bond being referred to would be: run a seperate ground conductor either to the frame or body or both. Even come right off the battery with a length of
#8 or
#6 high strand count wire. Bypassing the factory jumped. Sometimes those bonding straps will actually oxidize on the inside. I don't recall if they are copper clad or solid copper, clad is no good. Regardless, testing with a bypass jumper will give you an idea.
Low RPM sounds suspicious though. Either there is a high high resistance that is over come by the higher RPM or the alternator just isn't putting out what it should be at the lower RPM which should be carried by the batteries. Did you replace both batteries or just one?
I chased similar gremlins and understand the frustration.
Thanks for keeping us updated.
What year truck is this?
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