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Starter Motor
Starting System Description
The function of the starting system is to crank the engine. The battery supplies electrical energy to crank the starter motor.
When the ignition switch is turned to "START" position, or the starter button on the cowl is pushed in, the starter solenoid is
activated and completes the starting circuit between the battery and starter.
The neutral start switch opens the start circuit when the shift control lever is not in neutral. This prevents accidental starting
when engine is in gear.
The starting system consists of the following components.
•
Battery
•
Starter solenoid
•
Neutral safety switch
•
Starter motor
•
Ignition key switch/start button
Engaging the starter motor while the engine is operating can damage the starter motor or flywheel. Do not engage the starter
motor continually for longer than 15 seconds. Do not engage the starter motor when the engine is operating.
Troubleshooting the Starting Circuit
Before beginning the starting circuit troubleshooting flowchart, first check for the following conditions:
•
Make sure that battery is fully charged.
•
Ensure the control lever is in neutral position.
•
Check terminals for corrosion and loose connections.
•
Check cables and wiring for frayed and worn insulation.
•
Check in‑line fuse.
Starter Solenoid Test
1.
Disconnect all wires from the solenoid.
2.
Connect an ohmmeter between terminals 1 and 2.
3.
Connect a 12 volt power supply between the black wire "3", and the green wire "4". The solenoid should click and the
meter should read 0 ohms (full continuity).
4.
If the meter does not read 0 ohms (full continuity), replace the solenoid.
DMT 2004 Digital Multimeter
90-8M0105568 eng MARCH 2016
NOTICE
1
BLK
GRN
2
91‑892647A01
© 2016 Mercury Marine
Charging and Starting System
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Page 2B-37
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