2007 YAMAHA WR 450F battery

6 - 24
–+ELECLIGHTING SYSTEM
CHECKING THE TAILLIGHT (LEDs)
1. Disconnect the taillight coupler.
2. Connect two jumper leads 1 from the bat-
tery terminals to the respective coupler ter-
minal as shown.
3. Check:
•LED (for proper operation)
Does not light → Replace the taillight
assembly.
WARNING
A wire that is used as a jumper lead must
have at least the same capacity of the bat-
tery lead, otherwise the jumper lead may
burn.
This check is likely to produce sparks,
therefore, make sure no flammable gas or
fluid is in the vicinity.
Battery (+) terminal →

Blue lead
2
Battery (–) terminal →

Black lead
3
AC MAGNETO INSPECTION
1. Inspect:
•Lighting coil resistance
Out of specification → Replace.
Tester (+) lead
→ Yellow lead
1
Tester (–) lead
→ Ground
2
Lighting coil
resistanceTester selector
position
0.224 ~ 0.336
Ω
at 20 °C (68 °F)Ω
× 1

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–+ELEC
RECTIFIER/REGULATOR INSPECTION
1. Connect the battery leads.
2. Start the engine.
3. Turn on the headlight and taillight by turn-
ing on the lights switch.
4. Inspect:
•Out-put voltage
Out of specification → Replace rectifier/
regulator.
Tester (+) lead → Yellow lead 1
Tester (–) lead → Black lead 2
Out-put voltageTester selector
position
12.5 ~ 13.5 V at
5,000 r/minACV-20
R
BW
Y1
2
LIGHTING SYSTEM

–+ELEC
6 - 26
SIGNALING SYSTEM
SIGNALING SYSTEM
INSPECTION STEPS
If the speedometer will not operate, use the following inspection steps.
*1 marked: Refer to “BATTERY INSPECTION AND CHARGING” section in the CHAPTER 3.
NOTE:
•Remove the following parts before inspection.
1) Headlight
•Use the following special tools in this inspection.
Pocket tester:
YU-3112-C/90890-03112
*1 Check battery. Recharge or replace.
Check each coupler and
wire connection.Repair or replace.
Check multi-function dis-
play.Input voltage Replace wire harness.
Output voltageReplace multi-func-
tion display.
Check speed sensor. Replace.
OK
OK
OK
No good
No good
No good No good
No good