HI
In that period the BJ7# 3B usually were 24V. The position of the batteries is no indication, though.
If a cable connects positive with negative between the two batteries (serial), its 24V.
There were three alternators for YoM 1984-1988 24V:
2702056230 25A
2702056310 30A
and 2702056320 30A...
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