94
ELECTRICAL AND IGNITION
GROUND CIRCUITS
GROUND CIRCUITS
All grou nd circuit s 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 co ntinuity of grou nd
circuits. Calibrate the ohmmeter on the high ohms
scale. Resistance readings fo r all ground circu its
should be 0 W.
• System/power supp ly grou nds: Check continu-
ity between terminal pins 5, 7, and 8 of EMM J2
connector and the main harness ground.
• Injector circu it g rounds: Check continuity
between te rminal p ins 14, 20, a nd 2 1 of the
EMM J1 -B conne ctor a nd the main h arness
ground.
• Sensor circuit g rounds: Check continuity
between terminal pin s 26 and 27 of the EMM
J1-A co nnector and the appropriate sensor
ground connections. Refer to wiring diagrams.
Additional Ground Tests
Check connections and continuity at the following
locations:
• Starter solenoid terminal B and main harness
ground.
• Trim and Tilt module ground a t main h arness
ground.
FUSE
The engine h arness 12 V (B+) circu it is pro tected
by one automotive style 10 amp minifuse.
The fuse is located on the port side of the p ower-
head, in the flywheel cover.
IMPORTANT: Repeat failures of fuse could be
the result of faulty conne ctions or a ccessories.
The 12 V a ccessory circuit (purple wire from ter-
minal “A” of key switch) is of ten used to power
accessories.
1. Main harness ground
2. Ground stud (battery)
002292
1. Fuse
2. Spare fuse
005004
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