Mercury 40 Service Manual page 103

CHARGING AND STARTING SYSTEM
No voltage reading;
proceed to TEST 3.
TEST 3
a. Reconnect BLACK ground wire(s).
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 BLACK wire be-
tween battery (+) positive terminal and Test
Point 6.
No voltage reading; De-
fective starter solenoid.
No voltage reading; check Yellow cable
for poor connection or open circuit.
Page 2B-16
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
Connect voltmeter between common engine ground and Test Point 6.
TEST 7
a. Connect voltmeter between common engine ground and Test Point 1.
b. Turn ignition key to "Start" position.
TEST 8
a. Reconnect Yellow (starter motor) cable to starter solenoid Test Point 1.
b. Connect voltmeter between common engine ground and Test Point 7
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 7.
Electric Start Tiller Handle Model
Neutral start switch is open or BLACK leads are
disconnected or damaged.
12 Volt Reading*
Neutral start switch is open, or YELLOW/RED
or BLACK 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.
12 Volt Reading*
Should hear solenoid click; proceed to TEST 8.
12 Volt Reading*
Check BLACK ground cable at starter for loose
or corroded connection, or open circuit. If
cable is O.K., check starter motor.
90-828631R3 MARCH 1999
* Battery Voltage