133
ELECTRICAL AND IGNITION
GROUND CIRCUITS
7
GROUND CIRCUITS
All ground circuits are essential to reliable out-
board performance. Make sure all ground connec-
tions are clean and tight. Refer to wiring diagrams
for specific wiring details.
EMM Ground Tests
Disconnect the battery cables at the battery.
Use an ohmmeter to check continuity of ground
circuits. Calibrate the ohmmeter on the high ohms
scale. Resistance readings for all ground circuits
should be 0 Ω.
• System/power supply grounds: Check continu-
ity between terminal pins 4, 5, 9, 14, 15, 16, 23,
24, 25 and 27 of EMM J2 connector and the
main harness ground.
• Injector circuit grounds: Check continuity
between terminal pins 9 and 27 of the EMM J2
connector and the main harness ground; and
between terminal pins 9, 10, 15, 16 and 22 of
the EMM J1-B connector and the main harness
ground.
• Ignition circuit grounds: Check continuity
between terminal pins 17, 18, and 24 of the
EMM J1-B connector and port and starboard
cylinder head ground screws.
• Sensor circuit grounds: Check continuity
between terminal pins 4 and 11 of the EMM
J1-A connector and the appropriate sensor
ground connections. Refer to wiring diagrams.
Additional Ground Tests
Check connections and continuity at the following
locations:
• Trim and Tilt module ground at main ground ter-
minal.
• CPS connector pin 3 and main harness ground.
• Check continuity between ground terminals at
port and starboard cylinder head ground screws
and the main harness ground.
FUSE
The engine harness 12 V (B+) circuit is protected
by one automotive style 10 amp minifuse.
The fuse is located on the port side of the power-
head, in the flywheel cover.
IMPORTANT: Repeat failures of fuse could be
the result of faulty connections or accessories.
The 12 V accessory circuit (purple wire from ter-
minal “A” of key switch) is often used to power
acccessories.
1. Main engine harness ground
2. Ground stud (battery)
005315
2
1
1. Grounds, starboard cylinder head 005316
1. Fuse
2. Spare fuse
005317
1
1
2
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