Starter Circuit Troubleshooting Flow Chart(Centrifugal Bendix) - Mercury 150 EFI Service Manual

Starter Circuit Troubleshooting Flow Chart (Centrifugal Bendix)
No Continuity Indicated -
BLACK NEGATIVE (-) battery cable between the NEGATIVE (-)
battery post and the powerhead.
Check cable for loose or corroded connections.
Check cable for open.
No voltage reading:
proceed to TEST 3.
TEST 3
a. Reconnect BLACK ground wire.
b. Connect voltmeter between common engine ground and Test Point 3.
c. Turn ignition key to "Start" position.
No voltage reading:
Proceed to TEST 4
No voltage reading:
Proceed to TEST 5
No voltage reading:
Proceed to Test 6.
No voltage reading:
Check RED wire between battery (+)
POSITIVE terminal and Test Point 6.
90-883728 JULY 2001
Starter Motor Does Not Turn
SAFETY WARNING: Disconnect YELLOW (starter motor)
cable from starter solenoid test point 1 BEFORE making
tests 1-thru-7 to prevent unexpected engine cranking.
TEST 1
Use an ohmmeter (Rx1 scale) and connect meter leads
between NEGATIVE (-) battery post and common pow-
erhead ground.
There is an open circuit in the
Test 2
a. Disconnect BLACK ground wire(s) from Test Point 2.
b. Connect voltmeter between common engine ground and Test Point 2.
c. Turn ignition key to "Start" position.
12 Volt Reading
Defective starter solenoid
TEST 4
a. Connect voltmeter between common
engine ground and Test Point 4.
b. Turn ignition key to "Start" position.
TEST 5
Connect voltmeter between common
engine ground and Test Point 5
TEST 6
Check for voltage between common engine ground and Test Point 6.
CHARGING & STARTING SYSTEM
Continuity Indicated
Proceed to TEST 2
12 Volt Reading*
Check BLACK ground wire for poor connection
or open circuit.
Reconnect ground wire to starter solenoid.
Proceed to TEST 7.
12 Volt Reading*
Neutral start switch is open or YELLOW/RED
wire is open between Test Points 4 and 3.
12 Volt Reading*
Defective ignition switch.
12 Volt Reading*
Check fuse in RED wire between Test Points
5 and 6.
Check for open RED wire between Test Points
5 and 6.
*
Battery Voltage
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