Mercury V8 300 User Manual

Moving Propeller (MP) Alert
The engine harness is equipped with a lead for direct connection to a moving propeller light. The light is an accessory that must
be purchased separately.
a - PCM connector A
b - Moving propeller (MP) alert connector
c - PCM connector C
d - Chassis ground (–)
Connector Pin Wire Color Function PCM
65667
A
B
C
A Purple 12 V wake circuit (+) CC1
B Blue/red MP alert signal AG1
C Black Chassis ground (–) –
Power Steering
Electric power steering is standard and required on all advanced midsection (AMS) models. It may also be optionally installed
on conventional midsection (CMS) models. The electric pump receives a signal to turn on from the 3‑pin signal harness on the
engine. The pump should only operate while the engine is running. Refer to the troubleshooting procedure below if the pump is
not operating.
a - PCM connector A
b - Power steering connector
c - PCM connector C
d - Chassis ground (–)
104B
102B
PPL
BLK
BLU/RED
BLU/RED
PPL
BLK
A
B
C
H4
C1
A1
A1
G1
H4
A
B
C
A
B
C
D
E
F
G
H
1
2
3
4
A
B
C
D
E
F
G
H
A
H
1
4
A
B
C
D
E
F
G
H
1
2
3
4
A
B
C
D
E
F
G
H
H
A
4
1
65455
a
b
c
d
104B
102B
102A
PPL
BLK
BLK
WHT/BLU
WHT/BLU
PPL
A
B
C
H4
C1
A1
A1
G4
H4
A
B
C
D
E
F
G
H
1
2
3
4
A
B
C
D
E
F
G
H
H
A
4
1
A
B
C
D
E
F
G
H
1
2
3
4
A
B
C
D
E
F
G
H
A
H
1
4
65459
a
b
c
d
BC A
Accessories
Page 5C-4 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018

Mercury V8 300 Specifications

General

Horsepower	300 HP
Displacement	4.6 L
Full Throttle RPM Range	5200-6000 RPM
Fuel Induction System	Electronic Fuel Injection (EFI)
Gear Ratio	1.75:1
Starting	Electric
Shaft Length	20 in, 25 in, 30 in
Warranty	3-Year Limited Warranty
Engine Type	V8
Fuel Type	87 Octane
Bore x Stroke	92 mm x 86 mm