Snowmobile Yamaha FX10X, FX10RTX, FX10RTRX, FX10RTRAX, FX10MTX, FX10MTRX, FX10MTRAX. Manual - part 81

8-18

–

+

ELEC

CHARGING SYSTEM

CHARGING SYSTEM

CIRC

UIT D

IAGRA

M

R

/W

L/

W

(BLACK)

L/

W

R

/G

R

/W

L/

W

Y

Lg

G

(BLACK)

B

Br

/B

L

R

/WG

/Y

R

/G

R

/L

R

/WL

/R

R

W

Br

Br/L

Y

/R

P

/L

W

/G

R

/G

Br

/L

L

/B

O

Lg

B

G

/Y

L

/R

B

G

/B

R

/Y

Br

/L

R

/B

Gy

/R

O

/G

L

Br

/W

P

G

/W

L

/WR

/W

Gy

P

/W

R

/LC

h

Y

/L

W

L

/Y

B

/L

Y

/W

Y

/GB

/Y

Y

Lg

R

/W

L

/W

Y

/G

Lg

R

/W

L

/W

R

/W

L

/W

R

/G

Ch

Y

G

B

G

/Y

Br

/L

B

/Y

L

/Y

Lg

Y

/R

R

/Y

Gy

O

Gy

/R

O

/G

R

/B

G

/B

L

/B

B

B

L

/R

R

/L

L

Y

W

P

/W

P

G

/W

Br

/W

B

/L

R

/G

P

/L

W

/G

Br

/L

Y

/W

Y

/L

R

/BR

/L

G

/BR

/L

L

/BR

/L

B

B

HI

LO

G

B

Y

Y

G

B

G

B

Y

B

L

B

L

(BLACK)

(BLACK)

B

L/

W

Br

R

/Y

R

/W

Br

/W

Br

R

OFF

ON

START

RUN

STOP

OFF

ON

CLOSE

OPEN

Y

/L

Y

/W

Ch

Y

/WY

/L

B

/L

P

O

/R

B

/W

LW

B

/L

G

L

/R

B

LY

B

L

/W

Lg

G

L

W

/B

G

B

O

/B

L/

BG

/BR

/BR

/L

P

/W

R

/G

Y

B

/L

L

P

R

/YW

/G

Br

/L

(GRAY)

P

/L

L/

B

G

/B

R

/B

R

/L

P

/W

R

/G

Y

B

/L

L

P

/BR

/Y

W

/G

Br

/L

(GRAY)

P

/L

Y

/G

Y

/G

B

/L

Ch

(BLACK)

(BLACK)

B

/Y

B

/Y

G

L/

R

B

L/

R

G

B

L

/Y

Ch

Y

R

/B

R

/W

G

/B

R

/W

G

/B

Y

R

/B

L

/Y

Ch

G

/W

B

/L

B

/L

G

/W

Br

/W

(BLACK)

Br

Br

(BLACK)

R

/W

B

/L

(BLACK)

Gy

Gy

(BLACK)

B

R

/W

(BLACK)

O

R

/W

(BLACK)

Gy

/R

R

/W

(BLACK)

O

/G

R

/LR

/B

(GRA

Y)

R

/LG

/B

(GRA

Y)

R

/LL

/B

(GRA

Y)

B

/L

Y

L

(BLACK)

B

R

/L

R

/G

P

/L

R

/Y

(BLACK)

Br

/L

W

/G

R

/Y

G

/W

B

/L

(DARK GREEN)

Y

/G

B

W

Lg

B

L/R

G

G

L/R

B

(GREEN)

G

G

/B

Ch

Br

P

P

L/R

B

Y/R

B

B

B

Y/R

B

B

(GREEN)

(GRA

Y)

Ch

R

/B

Br

/W

B

/L

(BLACK)

L

(BLACK)

P

/W

B

/L

L

(BLACK)

P

/BB

/L

W

(GRAY)

WW

R

(BLACK)

B

R

R

R

/WG

/BL

/YR

/B

(BLACK)

Ch

Y

WIRE HARNESS

FUEL INJECTION SYSTEM

SUB-WIRE HARNESS

A

WIRE

HARNESS

OIL PRESSURE

SWITCH

SUB-LEAD

B

WIRE

HARNESS

WIRE

HARNESS

TAIL/BRAKE

 LIGHT 

SUB-LEAD

SPEEDOMETER

UNIT SUB-LEAD

C

E

WIRE

HARNESS

REVERSE SWITCH

SUB-WIRE HARNESS

F

WIRE

HARNESS

COOLANT

TEMPERATURE

SENSOR SUB-LEAD

G

L/

R

B

B

L/

R

È

É

ÈÉ

R

Gy

B

B

/L

R

/Y

L

/W

Br

B

Br
R

W

W

W

R

R

O

/B

O

/B

B

L

/W

L

/R

Br

/B

R

/Y

Br

/B

R

/W

L

B

B

R

B

B

Br

R

/W

B

/Y

Lg

Y

/R

Y

/R

B

B

B

Y

/G

R

/G

R

/L

R

/W

L

/R

R

/L

B

R

/Y

G

/W

B/L

B/L

Br/W

R

/Y

Ch

L

L

/W

L

/W

Ch

R

/B

L

/R

G

G

L/

R

B

G

/B

Ch

Ch

Ch

Ch

Lg

B

G

/Y

Br/L

W

W

W

W

R

R

Lg

R

/W

O

R

/W

Gy

/R

R

/W

O

/G

L

Y

B

/L

L

W

B

/L

R

Y

Lg

R

/W

R

/W

R

/W

Y

Y

Y

G

B

L

/Y

Y

/W

Ch

Y

/L

L

/Y

G

/B

R

/B

E

E

R

/B

R

/B

E

R

/B

A

G

/B

A

L

/B

R

/B

G

/B

L

/B

A

L

L

A

Y

Y

L

/R

L

/R

F

Y

/G

Y

/G

B

A

B

/L

B

/L

A

R

/G

R

/G

A

P

/L

P

/L

A

W

/G

W

/G

A

Br

/L

P

/W

B

/L

L

P

/B

B

/L

L

Br

/L

R

/G

P

/L

W

/G

Br

/L

A

R

/Y

A

P

/W

A

P

A

G

/W

G

B

/L

R

/Y

P

/W

P

/B

G

/W

B

/L

G

E

G

/B

L

/Y

G

/B

E

E

B

B

C

B

B

B

P

P

L

/R

B

F

G

G

C

L/

R

L/

R

C

R

/L

R

/L

A

(BLACK)

(BLACK)

Lg

EE

F

G

H

I

J

J

J

K

8

9

0

A

BC

D

1

2

3

4

5

6

7

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

[

\

]

_

a

b

c

d

e

f

g

h

h

i

j

k

l

m

n

o

p

q

r

1

R

e

ctifier/regulator

2

AC ma

gne

to

5

Main

 f

u

se

7

Battery

Z

Fra

m

e g

rou

nd

8-19

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+

ELEC

CHARGING SYSTEM

TROUBLESHOOTING

1. Connect:

• Pocket tester

(to the battery terminals)

2. Measure:

• Battery voltage

OK

BATTERY IS NOT CHARGED.

Battery voltage:

More than 12 V at 20 °C (68 °F)

OUT OF SPECIFICATION

• Check the battery.
• Replace or charge the battery.

Refer to “BATTERY INSPECTION” in CHAP-
TER 2.

3. Start the engine and accelerate to 5,000 r/min.

NOTE:

Place the snowmobile onto a suitable stand to raise
the track off of the ground.

4. Measure:

• Charging voltage

CAUTION:

Never disconnect the battery leads while the
generator is operating; otherwise, the rectifier/
regulator will be damaged.

OK

Charging voltage:

14 V/5,000 r/min

OUT OF SPECIFICATION

• Check the main fuse.

Refer to “FUSE INSPECTION” in CHAPTER 2. 

• Check the stator coil.

OK

FAULTY

Replace the main fuse and/or the sta-
tor coil.

Replace the rectifier/regulator.

OK

Check the charging system wiring.
Refer to “CIRCUIT DIAGRAM”.

Correct the connector.

FAULTY

Properly connect or repair the charging system
wiring.

8-20

–

+

ELEC

CHARGING SYSTEM

BATTERY

Inspection

1. Inspect:

• Battery condition

Refer to “BATTERY INSPECTION” in CHAP-
TER 2.

Battery Storage
The battery should be stored if the snowmobile is
not going to be used for a long period.

1. Remove:

• Battery

WARNING

When removing the battery, disconnect the
negative battery lead first.

Battery storage and maintenance tips:
• Recharge the battery periodically.
• Store the battery in a cool, dry place.
• Recharge the battery before reinstalling.

Refer to “BATTERY INSPECTION” in CHAPTER
2.

STATOR COIL

1. Disconnect:

• Stator coil coupler 

2. Connect:

• Pocket tester

(to the stator coil coupler)

3. Measure:

• Stator coil resistance

Out of specification 

→ Replace.

Stator coil resistance:

0.22 ~ 0.26 

Ω at 20 °C (68 °F)

(White – White)

W

W W

8-21

–

+

ELEC

CHARGING SYSTEM