Typical dual-engine application
a - Starboard engine
b - Alternator sense wire
c - Port engine
d - Battery isolator
e - Battery disconnect switch
f - Port engine cranking battery
g - Starboard engine cranking battery
h - Engine ground
1
2
B
O
1
2
B
O
b
d
f
h
b
50588
d
h
e
e
g
a
c
Charging System
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 4C-15