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Oh, and drop to two batteries:)

Replace it or bypass it…

Yep, you want in the upper 12s on battery voltage to proceed. They also need to deliver a respectable amount of current when loaded to the test voltage(crank amp test). The diodes in the LBCD should only drop the voltage 0.3-0.5V from the battery terminal to the load terminal on the 12 and...

Well if you are only getting 5.1 on the 24v load terminal with the 24v batt terminal connected, the 24v diodes are not passing correctly or you have a bad 24v connection at the LBCD. the batt power runs from batteries to the 24v batt terminal(alternator 24 is also connected here) thru the...

Drop to just 2 batteries, have them LOAD TESTED. Check EVERY connection between alt and battery. The LBCD samples the F- signal from the regulator to sense alternator load. When it senses the alt is being driven to full field/overloaded, it disconnects the batteries from the alt. If it is not...