Yamaha TW200N Service Manual page 85

4. Neutral relay
• Remove the neutral relay from the wire har-
ness.
• Connect the pocket tester (Ω × 1) and the
battery (12 V) to the neutral relay terminals.
• Check the neutral relay for continuity.
Battery positive terminal → brown 1
Battery negative terminal → sky blue 2
Tester positive probe → blue/white 3
Tester negative probe → black/white 4
• Does the neutral relay have continuity
between blue/white and black/white?
YES
ELECTRIC STARTING SYSTEM
NO
Replace the Neutral
relay.
– 78 –
5. Diode
• Remove the diode from the wire harness.
• Connect the pocket tester (Ω × 1) to the
diode terminals as shown.
• Check the diode for continuity.
Tester positive probe →
blue/white 1
Tester negative probe →
blue/black 2
Tester positive probe →
blue/black 2
Tester negative probe →
blue/white 1
• Is the diode OK?
YES
– +
ELEC
Continu-
ity
No conti-
nuity
NO
Replace the diode.