Mercury 250 Specifications download pdf (Page 106)

OUTBOARD INSTALLATION

Dual Outboards

Connect a common ground cable (wire size same as engine

battery cables) between negative (–) terminals on starting

batteries.

(-)

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a - Red sleeve ‑ Positive (+)

b - Black sleeve ‑ Negative

(–)

c - Ground cable

d - Cranking battery

HOSE AND TUBING CONNECTIONS

Fuel Hose

The minimum fuel line inside diameter (I.D.) is 8 mm (5/16 in.), with

a separate fuel line/fuel tank pickup for each engine.

Fasten the remote fuel hose to the fitting with a hose clamp.

Oil Hoses

Connect the remote oil hoses to the engine hose connections.

Fasten hose connections with cable ties.

Water Pressure and Speedometer Hose or Tubing

NOTE: This applies to models without SmartCraft gauges.

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Mercury 250 Specifications Page 106