Mercury MerCruiser MCM 7.4L MPI User Manual

WIRING DIAGRAMS
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 4E-5
A - Charging And Starting System
1-Alternator
2-Ground Stud
3-Starter Motor
4-Battery
5-Circuit Breaker
6-Starter Slave Solenoid
B - Audio Warning System
1-Oil Pressure Switch
2-Drive Unit Oil Level Bottle Switch
C - Instrumentation System
1-Oil Pressure Sender
2-Water Temperature Sender
3-Trim Sender
a-Positive (12V) Power Wire To Fuel Injection System Harness
b-Harness Connector To Fuel Injection System Harness
c-Auxiliary Tachometer Lead
d-90 Amp. System Fuse (DO NOT Remove)
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Index

Mercury MerCruiser MCM 7.4L MPI Specifications

General

Engine Type	V8
Bore	4.25 in (108 mm)
Compression Ratio	8.6:1
Ignition System	Electronic Ignition
Alternator	65 Amp
Displacement	7.4L (454 cu in)
Fuel System	Multi-Port Fuel Injection (MPI)
Horsepower	310 HP
Torque	450 lb-ft
Cooling System	Closed Cooling
Fuel Requirement	87 octane (minimum)
Stroke	4.00 in (101.6 mm)