Yamaha F50D Servise Manual - page 110

Electrical system

5-21

ELEC

TIP:

9

To  prevent the engine from starting when

cranking it, make sure to disconnect all

spark plug caps.

9

Measure the input voltage while the engine

is cranking.

4.

Turn the engine start switch to “OFF”,

and then disconnect the special service

tool 

1

.

5.

Connect the special service tool 

1

 to the

hour meter coupler 

b

.

6.

Connect the battery leads to the connec-

tor 

c

 and 

d

, and then check that the all

segments are displayed on hour meter

for 2 seconds. Replace the hour meter if

there is no display.

7.

Disconnect the battery leads and special

service tool 

1

, and then connect the

hour meter coupler 

a

.

Starting unit and components

Checking the fuse

1.

Check the fuse 

1

 and fuse holder 

2

 for

continuity. Replace if there is no continu-

ity.

Checking the starter relay

1.

Disconnect the starter relay lead connec-

tor 

a

.

2.

Set the gear shift to the “N” position.

3.

Turn the engine start switch to “START”,

and then measure the input voltage at

the starter relay lead connector 

a

.

Check the engine start switch, neutral

switch and wiring harness if below speci-

fication.

4.

Disconnect the ground lead 

b

, starter

motor lead 

1

  and positive battery lead

2

, and then remove the starter relay 

3

.

Y

G

B

O

P

Y

B

G/W

R

b

1

c

d

a

b

G/W

B

Y

Starter relay input voltage:

Brown 

a

–Ground

12.0 V (battery voltage)

1

2

Br

Br

B

a

a