Honda SH300 2006 Manual page 481

Turn the ignition switch OFF.
Short the relay connector terminals of the wire har-
ness side with a jumper wire.
Connection: Red/Yellow – Red
Remove the maintenance lid (page 3-4).
Disconnect the fuse 10 A.
Turn the ignition switch "ON".
Measure the voltage between the fuse box terminal
connector of the wire harness side and ground.
Connection: Red/Yellow (+) – Ground (–)
If the battery voltage appears, the main relay switch
line is normal.
Inspect the main relay function test (page 22-25).
If the battery voltage does not appear, inspect the
following:
– Open circuit in Red wire between the main fuse
and main relay switch line side
– Open circuit in Red/Yellow wire between the
main relay and fuse box
FUNCTION TEST
Remove the main relay (page 22-26).
Connect an ohmmeter to the switching side relay
terminals.
CONNECTION: A – B
Connect a 12 V battery to the coil side relay termi-
nals.
CONNECTION: C (+) – D (–)
There should be continuity while the battery is con-
nected to the relay terminals and there should be no
continuity when the battery is disconnected.
LIGHTS/METERS/SWITCHES
JUMPER WIRE
R
RELAY CONNECTOR
FUSE BOX
FUSE 10 A
TERMINAL
RELAY
A B
C
D
D C B
R/Y
R/Y
A
22-25