Mercury 92‑813054A2 Manual page 81

Section 5 - Maintenance
Battery Switches. Battery switches should always be positioned so that each engine is operating off of its own battery. Do not
operate engines with switches in the both or all position. In an emergency, another engine's battery can be used to start an
engine with a dead battery.
Battery Isolators. Isolators can be used to charge an auxiliary battery used for powering accessories in the boat. They should
not be used to charge the battery of another engine in the boat unless the type of isolator is specifically designed for this
purpose.
Generators. The generator's battery should be considered another engine's battery.
90-8M0069748 APRIL 2012 Page 73
eng