Mercury MERCRUISER, Service Manual, Page: 149 / 566

4. Connect the remaining harnesses to the engine.
a - 5‑amp clean power
b - OBD‑M MIL
c - 16‑pin transom harness
d - 14‑pin connection
e - Boat harness (tanks)
f - Depth/RS‑485
SmartCraft Product
A Mercury SmartCraft System instrument package can be purchased for this product. A few of the functions the instrument
package will display are: RPM, coolant temperature, water pressure, battery voltage, fuel consumption, engine operating hours,
engine alarm data, and potential problems. The SmartCraft instrument package will also aid in engine diagnostics.
Audio Warning System Connections—TowSport, Inboard
!
WARNING
Installing non‑potted electrical components in explosive environments can result in serious injury or death from fire or
explosion. Install all non‑potted electrical components such as warning alarms away from environments where fuel or fuel
vapor is present such as engine or fuel tank compartments.
1. Select a location for the audio warning alarm that meets all of the following:
• Alarm can be easily heard, yet is out of sight.
• Alarm can be easily accessed for installation and maintenance.
• Alarm will remain dry.
• Alarm is within length limits of the 46 cm (18 in.) purple alarm wire that connects to the "I" terminal or 12 volt source
on switched side of ignition switch.
NOTE: The terminal to which the wire is attached must have no voltage when the ignition switch is in the "OFF" position.
2. Place the alarm in the desired location and secure it to the wire bundle with the cable tie provided.
3. Connect the tan/blue wire from the alarm to the tan/blue wire from the instrument harness.
4. Connect the purple wire from the alarm to any purple wire terminal on the instrument gauge or ignition switch. Tighten the
connection securely.
a - Alarm
b - Tan/blue wire
c - Purple wire
a
b
c
d
e
f
55244
45019
a
b
c
Installation
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 2B-45