If there is no voltage, connect the multimeter's
negative terminal to earth and the positive terminal
to the white wire on the automatic choke device.
With the ignition switch turned onto the «ON» po-
sition, check for the presence of battery voltage. If
no voltage is detected, check the wiring connected
with the ignition switch and the two fuses 15A (no.
8).
If voltage is present, repeat the check from the ig-
nition control unit connector.
After disconnecting the choke device, start the en-
gine and keep it idling. Check for the presence of
voltage by connecting the multimeter's positive
terminal to terminal no. 5 (white/green) and its
negative terminal to terminal no. 7 (white/black)
(see figure).
If no voltage is detected, replace the control unit
after verifying the integrity of the fuses, otherwise
check the wiring between the choke and the elec-
tronic control unit and if necessary proceed by
replacing the choke device.
Turn signals system check
If the turn signal lights fail to operate, proceed as follows:
- Detach the control unit connector and check for potential difference at terminal no. 4 (red/black) with
respect to earth (p.d. must be equal to battery voltage).
- Check that the same p.d. (battery voltage) is present between terminals no. 4 and no. 8 (black).
- Repeat the same check between terminals no. 5 (white/green) and no. 8 (black) with the ignition switch
turned to the «ON» position, the side-stand retracted, and the emergency cut-off switch in the «RUN»
position.
B 125-250 Electrical system
ELE SYS - 93
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