Mercury 75 Pro XS FourStroke Operation Maintenance Installation Warranty Manual page 134

Dual Outboards
Connect a common ground cable (wire size same as engine battery cables)
between negative (–) terminals on starting batteries.
b
c
a - Red sleeve ‑ positive (+)
b - Black sleeve ‑ negative (–)
c - Ground cable
d - Cranking battery
FUEL HOSE CONNECTION
Install and secure the quick disconnect fuel hose fitting with a hose clamp.
Position the hose clamp so that it will not chafe or cut into an adjacent wiring
harness.
Inspect the position of the hose clamp to ensure that it will not chafe or cut
into the adjacent wiring harnesses.
OUTBOARD INSTALLATION
b
a
(-)
NOTICE
a
(-)
d
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