Yamaha YFM660FS Grizzly 4x4 Supplementary Service Manual page 421

CHECKING THE BULBS AND BULB SOCKETS
WARNING
Since the headlight bulb gets extremely
hot, keep flammable products and your
hands away from the bulb until it has
cooled down.
CAUTION:
Be sure to hold the socket firmly when
G
removing the bulb. Never pull the lead,
otherwise it may be pulled out of the ter-
minal in the coupler.
Avoid touching the glass part of the head-
G
light bulb to keep it free from oil, other-
wise the transparency of the glass, the
life of the bulb and the luminous flux will
be adversely affected. If the headlight
bulb gets soiled, thoroughly clean it with
a cloth moistened with alcohol or lacquer
thinner.
2.Check:
Bulb (for continuity)
G
(with the pocket tester)
No continuity → Replace.
Pocket tester
P/N. YU-03112, 90890-03112
NOTE:
Before checking for continuity, set the pocket
tester to "0" and to the "Ω × 1" range.
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a.Connect the tester positive probe to terminal
and the tester negative probe to terminal
, and check the continuity.
b.Connect the tester positive probe to terminal
and the tester negative probe to terminal
, and check the continuity.
c.If either of the readings indicate no continu-
ity, replace the bulb.
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