Insert the positive terminal from the tester (setting
the tester on AC mode) on terminal no. 1 (yellow-
black wire) and the negative terminal on terminal
no. 2 (black wire); check for voltage (see figure).
If voltage is present, check the wiring from the
headlight to the voltage regulator, and the opera-
tion of the light switch.
If no voltage is found, put the negative terminal to
earth; if this provides voltage readings, check the
earth wire (terminal no. 2) on the regulator (black
wire); otherwise, replace the regulator as certainly
faulty.
As a last test it is possible to check the output volt-
age from the stator:
-Detach the regulator connector and interpose the
tester in AC mode, between the Gray-Blue wire (4)
and earth (see figure).
-The voltage output at 2,000 rpm must be approx.
25 - 35V
If this test also gives no voltage, replace the reg-
ulator as certainly faulty.
N.B.
TO MEASURE THE ABOVE VOLTAGE USE AN ANALOGUE
TESTER THAT CAN MEASURE ALTERNATING VOLTAG-
ES AND KEEP THE ENGINE AT IDLE TO HAVE AN ALTER-
NATING VOLTAGE OF A FREQUENCY AS CLOSE AS
POSSIBLE TO 50HZ SO AS TO DETECT THE EFFICIENT
VOLTAGE VALUE SUPPLIED BY THE REGULATOR
(ABOUT 12V).
Recharge system voltage check
3) BATTERY DOES NOT RECHARGE
The fault in the DC section of the voltage regulator
may cause, depending on the type of failure, the
following faults:
a) Bursting of protection fuse due to exces-
sively high voltage (regulator short-circuited)
and resulting in the battery not recharging.
b) Battery not recharging (regulator circuit in-
terrupted).
Interventions
MSS Fly 50 4T Electrical system
ELE SYS - 55
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