Mercury 225 EFI, Service Manual

Page: 132 / 719

CHARGING & STARTING SYSTEM
90-884294 OCTOBER 2001 Page 2B-41
Starter Circuit Troubleshooting Flow Chart (Solenoid Driven Bendix)
Starter Motor Does Not Turn
TEST 1
With ignition key in START position, check for battery volt-
age at TEST POINT 1.
Voltage indicated and solenoid clicks
Defective starter motor
No voltage indicated
Go to TEST 2
Voltage indicated and solenoid does not click
Defective starter solenoid
Voltage indicated at Test Point 9
is 9.5 volts or greater.
Voltage indicated at Test Point 9
is less than 9.5 volts.
Defective starter solenoid
SAFETY WARNING: Disconnect BLACK with RED sleeve (starter motor)
cable from slave solenoid test point 7 BEFORE making tests 1–thru–7 to
prevent unexpected engine cranking.
TEST 2
Use an ohmmeter (Rx1 scale) and connect meter leads
between NEGATIVE (–) battery post and common power-
head ground.
TEST 4
a. Reconnect BLACK ground wire.
b. Connect voltmeter between common engine ground and Test Point 4.
c. Turn ignition key to “Start” position.
12 Volt Reading*
Check BLACK ground wire for poor connection
or open circuit.
Reconnect ground wire to starter solenoid.
Proceed to TEST 8.
No Continuity Indicated –
There is an open circuit in the
BLACK NEGATIVE (–) battery cable between the NEGATIVE (–)
battery post and the powerhead.
•
Check cable for loose or corroded connections.
•
Check cable for open.
Continuity Indicated
Proceed to TEST 3
Test 3
No voltage reading:
proceed to TEST 4.
a. Disconnect BLACK ground wire(s) from Test Point 3.
b. Connect voltmeter between common engine ground and Test Point 3.
c. Turn ignition key to “Start” position.
Check for starter motor ground at Test Point 10
Good ground
Bad ground – clean cable ends
or replace ground cable