Ducati Electrical Specialist
||Ducati SL500 Pantah regulator.
Most Ducati regulators look much like this one, but there are quite
a variety of different models. This type has an integral rectifier, and
is commonly known as a regulator-rectifier.
|This is the SL500 Pantah alternator assembly. We can rewind
the stator, but if the magnets in the alternator rotor play
up, or if the keyway flogs out, then the rotor must be replaced. Most Ducatis
and other modern motorcycles have alternator setups much like this, although
the majority of Japanese models have an external rotor which doubles as
||The SL500 Pantah has ceramic balance resistors. These are common
to all models with Bosch ignition from about 1979 to 1986, including the
SD900 and MHR900 and Mille. The same part is used on the BMW car range
of the same era.
|CDI pickups or triggers can be repaired, which is just as well
as they can be quite hard to come by. These units are used by most Bosch
ignition models through to mid 1980 or so, and are common to some Laverda
and Moto Guzzi models.
||The solenoid is a heavy duty switch which transmits the power
to the startermotor. This Lucas unit is used on almost all Ducati models
from 1978 to about 1987. Generally speaking, if this unit makes a clicking
sound when you hit the starter button then it is working. It is cheaper
to replace it with a new or secondhand unit than to have it repaired.
If the solenoid clicks when you try to start the bike, but the engine
won't turn over, then the problem is with the battery or the startermotor.
Or, just possibly, you have a seized motor.
Don't panic, it's most likely the battery. Does the horn work? If the
horn makes a flat squark and the lights come on but dimly, then it's the
Don't rush out and buy a new one - re-charge it, and see if the problem
goes away. If your battery constantly discharges, seek advice from an auto
electrician or a knowledgeable motorcycle mechanic - you may have a wiring
fault (not unknown in Ducatis) or a faulty charging system.
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