Yamaha 2004 Rhino 660 YXR660FAS Service Manual page 394

6. If the differential gear lock indicator light
fails to come on:
1. Bulb and bulb socket
• Check the bulb and bulb socket for conti-
nuity.
2. Differential gear lock indicator light relay
• Remove the differential gear lock indicator
light relay from the wire harness.
• Connect the pocket tester (Ω × 1) and the
battery (12 V) to the differential gear lock
indicator light relay terminals.
• Check the differential gear lock indicator
light relay for continuity as follows.
Tester (+) lead →
Black/Green terminal 1
Tester (–) lead →
Black terminal 2
Battery (+) terminal →
Brown terminal 3
Battery (–) terminal →
Black/Red terminal 4 No conti-
Tester (+) lead →
Black/Green terminal 1
Tester (–) lead →
Black terminal 2
3. Four-wheel drive switch
Refer to "CHECKING THE SWITCH".
*
SIGNALING SYSTEM
CONTINUITY
Continu-
ity
nuity
CONTINUITY
CONTINUITY
9 - 42
NO CONTINUITY
Replace the bulb and/or bulb socket.
NO CONTINUITY
Replace the differential gear lock indicator
light relay.
NO CONTINUITY
Replace the gear motor.
– +
ELEC