Bosch internal regulator alternator wiring diagram Calcium-Calcium batteries definitely work at a higher system voltage so should be avoided in our old Holdens. I guess a simple rule of thumb would be "if the Bosch alternator has the old black square regulator built into the back of it your OK". If it's the newer style "European" type reg you should do some further investigation. Voltage Regulator for Bosch Type Alternators Voltage Regulator for Bosch Alternators. 24 Volt, B-Circuit, 28.3 Volt set point. Replaces: Bosch 0-192-033-003, 0-192-033-005; Komatsu 6102617, Lucas 21931015, Marelli 64800005, Massey Ferguson 2868511-M91; Mercedes 11548806, 21540206, 3505477102.
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