Troubleshooting - Yamaha YFM70RY Service Manual

EAS27260

TROUBLESHOOTING

Any of the following fail to light: headlight or taillight.
TIP
• Before troubleshooting, remove the following part(s):
1. Seat
2. Fuel tank top panel
3. Front panel
4. Front fender
1. Check the condition of each bulb
and bulb socket.
Refer to "CHECKING THE BULBS
AND BULB SOCKETS" on page
8-60.
OK ↓
2. Check the fuses.
(Main and headlight)
Refer to "CHECKING THE FUS-
ES" on page 8-61.
OK ↓
3. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-62.
OK ↓
4. Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 8-57.
OK ↓
5. Check the light switch.
Refer to "CHECKING THE
SWITCHES" on page 8-57.
OK ↓
6. Check the headlight relay.
Refer to "CHECKING THE RE-
LAYS" on page 8-65.
OK ↓
7. Check the entire lighting system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-15.
OK ↓
Replace the tail/brake light assembly.
NG →
Replace the bulb(s) and bulb socket(s).
NG →
Replace the fuse(s).
NG →
• Clean the battery terminals.
• Recharge or replace the battery.
NG →
Replace the main switch.
NG →
The light switch is faulty. Replace the han-
dlebar switch.
NG →
Replace the headlight relay.
NG →
Properly connect or repair the lighting sys-
tem wiring.
8-17
LIGHTING SYSTEM