Voltage regulator check
The malfunctioning of the voltage regulator might cause the following problems depending on the type
of fault:
1. The lighting system bulbs burn out.
2. The lighting system bulbs stop working.
3. The battery overcharges (the main fuse blows).
4. Non-recharging of the battery.
5. Non functioning of the turn indicators.
Operations
FAULT 1
Replace the regulator because it is definitely faul-
ty.
FAULT 2
Make sure the bulbs work properly.
With the vehicle running check for battery voltage
on the yellow-black wire of the high beam/low
beam switch. If there is no voltage make sure volt-
age is coming correctly from the stator: without
disconnecting the regulator connector and with the
vehicle running, use a tester to measure the alter-
nate voltages between the connection of the grey-
blue wire and black wire make sure it is within the
indicated values, if not replace the stator.
If no irregularities occur during these checks re-
place the regulator.
If replacement of the regulator does not restore
correct operation, carry out the checks of the elec-
trical system.
Specific tooling
020331Y Digital multimeter
Characteristic
Voltage distributed at 3000 rpms
25 to 30V
FAULT 3
After checking that there are no short circuits in the system towards the earth, replace the regulator
because it is certainly inefficient and replace it with a protective fuse.
Following the replacement, measure the current and the recharging voltage on the battery end.
Electrical system DNA 50
ELE SYS - 52
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