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So, since the 12v/24v 100a alternator isn't providing 70 - 90a @ 24v the batteries are making up the difference?

We are saying the essentially the same thing, except notice that only one connection is at P2, the rest are to P188. It would be nice to see the P2 pinout—

These pages show the CAT installed side (¿connector P1?) all in one place, the OEM side is liberally distributed about the other pages. It would be nice to find a pinout of the other connector, (¿P2 connector?). I still think the OEM tach was always run off the ring gear. Though the VDO...

Cat ECM pinout does show the tachometer feed on the OEM side, though I have yet to find it in the schematics. It does read in the J1939 feed to diagnostics. I keep wondering if it is in the connector under the windshield 'behind' the heater in all units, like in A0 units; and running off the...

Good thoughts— https://www.ceniehoff.com/Documents/Ctrl_Hyperlink/TG14_uid252021119472.pdf

I am far, far from an expert and know a little bit beyond nothing on these vehicles, though years ago with our caterpillar tractors I would have said. "Okay, we are good," with the readings in your video. I find as I wiggle the tester's lead on bolt heads, or try to ground on some...