Mercury 40 Service Manual

CHARGING AND STARTING SYSTEM
Page 2B-16 90-828631R3 MARCH 1999
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.
* Battery Voltage
TEST 2
TEST 3
TEST 4
TEST 5
TEST 6
TEST 7
TEST 8
12 Volt Reading*
12 Volt Reading
12 Volt Reading*
12 Volt Reading*
12 Volt Reading*
12 Volt Reading*
12 Volt Reading*
No voltage reading;
proceed to TEST 3.
No voltage reading;
proceed to TEST 4.
No voltage reading;
proceed to TEST 5.
No voltage reading;
proceed to TEST 6.
a. Reconnect BLACK ground wire(s).
b. Connect voltmeter between common engine ground and Test Point 3.
c. Turn ignition key to “Start” position.
Check BLACK ground wire for poor connection
or open circuit. Reconnect ground wire to starter
solenoid; proceed to TEST 7.
Neutral start switch is open, or YELLOW/RED
or BLACK wire is open between Test Points 4
and 3.
a. Connect voltmeter between common
engine ground and Test Point 4.
b. Turn ignition key to “Start” position.
Defective starter solenoid.
Connect voltmeter between common
engine ground and Test Point 5.
Defective ignition switch.
Connect voltmeter between common engine ground and Test Point 6.
No voltage reading; check BLACK wire be-
tween battery (+) positive terminal and Test
Point 6.
Check fuse in RED wire between test points 5 and 6.
Check for open RED wire between test points 5 and 6.
a. Connect voltmeter between common engine ground and Test Point 1.
b. Turn ignition key to “Start” position.
No voltage reading; De-
fective starter solenoid.
Should hear solenoid click; proceed to 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.
No voltage reading; check Yellow cable
for poor connection or open circuit.
Check BLACK ground cable at starter for loose
or corroded connection, or open circuit. If
cable is O.K., check starter motor.
Electric Start Tiller Handle Model
Neutral start switch is open or BLACK leads are
disconnected or damaged.

Mercury 40 Specifications

General

Horsepower	40 hp
Starting System	Electric
Steering	Remote
Fuel Induction System	EFI (Electronic Fuel Injection)
Shaft Length	20"
Full Throttle RPM Range	6000