Mercury Optimax - Page 112

OUTBOARD INSTALLATION
104
Dual Outboards
Connect a common ground cable (wire size same as engine
battery cables) between negative (–) terminals on starting
batteries.
(-)
(-)
a
a
b
b
c
d
d
15497
a - Red sleeve ‑ positive (+)
b - Black sleeve ‑ negative
(–)
c - Ground cable
d - Cranking battery