Checking The Bulbs And Bulb Sockets - Yamaha WR250R Service Manual

EAS27990
CHECKING THE BULBS AND BULB
SOCKETS
Check each bulb and bulb socket for damage or
wear, proper connections, and also for continu-
ity between the terminals.
Damage/wear → Repair or replace the bulb,
bulb socket or both.
Improperly connected → Properly connect.
No continuity → Repair or replace the bulb, bulb
socket or both.
Types of bulbs
The bulbs used on this vehicle are shown in the
illustration on the left.
Bulbs "a" and "b" are used for the headlights
G
and usually use a bulb holder that must be de-
tached before removing the bulb. The majority
of these types of bulbs can be removed from
their respective socket by turning them coun-
terclockwise.
Bulbs "c" is used for turn signal and can be re-
G
moved from the socket by pushing and turning
the bulb counterclockwise.
Checking the condition of the bulbs
The following procedure applies to all of the
bulbs.
1. Remove:
Bulb
G
EWA13320
WARNING
Since the headlight bulb gets extremely hot,
keep flammable products and your hands
ELECTRICAL COMPONENTS
away from the bulb until it has cooled down.
ECA14380
CAUTION:
Be sure to hold the socket firmly when re-
G
moving the bulb. Never pull the lead, other-
wise it may be pulled out of the terminal in
the coupler.
Avoid touching the glass part of the head-
G
light bulb to keep it free from oil, otherwise
the transparency of the glass, the life of the
bulb, and the luminous flux will be adverse-
ly affected. If the headlight bulb gets soiled,
thoroughly 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
90890-03112
Analog pocket tester
YU-03112-C
NOTE:
Before checking for continuity, set the pocket
tester to "0" and to the "Ω × 1" range.
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a. Connect the positive tester probe to terminal
"1" and the negative tester probe to terminal
"2", and check the continuity.
b. Connect the positive tester probe to terminal
"1" and the negative tester probe to terminal
"3", and check the continuity.
c. If either of the readings indicate no continuity,
replace the bulb.
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