Mercury MerCruiser Service Manual page 288

Engine Wiring Harness
Engine Wiring Harness
Harness Removal
Damaged wires can cause electrical problems, resulting in system failure. In some cases, this can affect boat operation,
leading to personal injury. Use conduit, hose clamps, grommets, or other appropriate measures to protect all electrical wires.
Do not overtighten clamps and keep harnesses away from heat sources during installation.
Disconnecting or connecting the battery cables in the incorrect order can cause injury from electrical shock or can damage
the electrical system. Always disconnect the negative (‑) battery cable first and connect it last.
1. Disconnect the battery negative (–) ground cable.
2. Disconnect the oxygen sensors.
a
3. Disconnect the wires at the starter.
4. Disconnect the starboard and port exhaust temperature sensors.
Page 3D-2
WARNING
!
CAUTION
!
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a
© 2016 Mercury Marine
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a - Starter connection
b - Starboard exhaust temperature
sensor
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90-8M0099748 eng DECEMBER 2015
Starboard precatalyst
oxygen sensor
Port precatalyst oxygen
sensor