93
ELECTRICAL AND IGNITION
GROUND CIRCUITS
6
GROUND CIRCUITS
All groun d 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 Ω.
• System/power supp ly groun ds: Check continu-
ity between terminal pins 4, 5, 9, 14, 15, 16, 23,
24, 25 and 2 7 of EMM J2 connector and the
main harness ground.
• Injector circu it gr ounds: Check continuity
between terminal pins 9 and 27 of the EMM J2
connector and the main harn ess grou nd; a nd
between te rminal p ins 9, 10 , 15, 16 a nd 22 of
the EMM J1-B connector and the main harness
ground.
• Sensor circuit g rounds: Check continuity
between termina l pins 4 and 1 1 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 followin g
locations:
• Trim and Tilt module ground at main ground ter-
minal.
• Check contin uity between g round te rminals at
port cylinder head gro und screw and th e main
harness ground.
FUSE
The engine harness 12 V (B+) circu it is protected
by one automotive style 10 amp minifuse.
The fuse is located on the st arboard side of th e
powerhead, fastened to the capacitor.
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 swit ch) is of ten used to power
accessories.
1. Main engine harness ground
2. Ground stud (battery)
004183
1. Ground, port cylinder head 007172
1. Fuse 004080
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