Checking The Lighting System - Yamaha YXR70FX Service Manual

EBS01070

CHECKING THE LIGHTING SYSTEM

1. The headlights fail to come on.
1. Headlight bulb and socket
• Check the headlight bulb and socket for
continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the headlight bulb and socket OK?
YES
NO
Replace the head-
light bulb, socket or
both.
9 - 30
LIGHTING SYSTEM
2. Headlight relay
• Remove the headlight relay.
• Connect the pocket tester (Ω × 1) and bat-
tery (12 V) to the headlight relay as shown.
È high beam
É low beam
Positive battery terminal → yellow 1
Negative battery terminal → black 2
Positive tester probe → blue 3
Negative tester probe →
È
3
4
2
1
B G Y
Y
L
É
3
5
• Does the headlight relay have continuity
between blue and yellow? È
• Does the headlight relay have continuity
between blue and green? É
YES
– +
ELEC
yellow 4 or green 5
B G Y
Y
L
NO
Replace the head-
light relay.