In combiner hookups, the alternator is directly connected to one of the batteries with no diodes in between which introduce a voltage drop or which can open circuit (or short circuit) on overload.
(the alternator; is directly connected; L:In combiner hookups) (no diodes in between; introduce; a voltage drop or which can open circuit (or short circuit) on overload) (a voltage drop; can open; circuit (or short circuit; on overload)
the alternator no diodes in between a voltage drop
is directly connected introduce can open
L:In combiner hookups
a voltage drop or which can open circuit (or short circuit) on overload
circuit (or short circuit on overload