Wire Color Code Abbreviations
Wire Color Abbreviations
BLK Black
BLU Blue
BRN Brown GRA Gray
GRN Green ORN Orange
PNK Pink PPL Purple
RED Red TAN Tan
WHT White YEL Yellow
LT Light DK Dark
Charging System
Charging System Wiring Diagram
a - Battery
b - Positive battery cable
c - Starter solenoid
d - 15‑amp fuse
e - 20‑amp fuse
f - Engine control module (ECM) harness
g - Voltage rectifier/regulator
h - Stator
Troubleshooting the Charging System
IMPORTANT:
The charging system may be damaged by:
• Reversed battery cables
• Running the engine with the battery cables disconnected and stator leads connected to the rectifier
• An open circuit, such as a broken wire or loose connection
A fault in the battery charging system usually will cause the battery to become discharged. Check the battery electrolyte level,
and charge the battery.
If the battery will not accept a satisfactory charge, replace the battery.
If the battery accepts a satisfactory charge, determine the cause of the charging system problem as follows.
• Check for correct battery polarity: red cable to positive (+) battery terminal. If polarity was incorrect, check for blown fuse
and damaged rectifier. Refer to Regulator/Rectifier Diode Test.
RED
BLK
WHT
YEL
WHT
YEL
BLU
BLK/RED
BLK
GRN
RED
J5
Charging and Starting Systems
Page 2B-8 © 2018 Mercury Marine 90-8M0125265 eng NOVEMBER 2017
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