Scramblers owners and service manuals


Ducati Scrambler 800 - Service manual > Alternator / Generator

The generator used on the Scrambler has a rated power of 490 W at 14 V and consists of a fixed element (stator/generator, A), located in the generator cover and a mobile element (rotor/flywheel, B) fastened to the crankshaft.

Charge system - Battery

Rotor (B) is manufactured with strong permanent magnets and features a lot of pin pairs for each stator phase. This allows generating alternate voltage at a higher frequency compared to a standard generator.

The result: at low rpm it is possible to generate higher current.

Important Check the charging current by using the "DDS" diagnosis instrument.

Attention Before testing, disconnect the generator wiring from the electrical system when the ignition key is set to OFF.

Charge system - Battery

Values significantly lower than those indicated above can be due to:

In the above cases the whole generator assembly (rotor and stator) should be replaced.

If checks have a favourable outcome, reconnect the generator to the regulator with ignition key on OFF.

Make sure that no cables are damaged or disconnected.

Removing the generator

For the removal procedure refer to chapter "Removing the flywheel/generator assembly".

Refitting the generator

For the refitting procedure refer to chapter "Refitting the flywheel/generator assembly".


Battery safety rules

Warning Before carrying out any operations on the battery, keep in mind the safety standards. When under charge, batteries produce explosive gases. Keep batteries away from heat sources, sparks or open flames.

Instructions for battery use

The battery is a sealed, maintenance-free type and therefore requires no special installation procedure.

Important Never try to open the battery as it is sealed, it does not require maintenance operations or to be filled in with acid or other types of liquids. Consequently, it does not need any operation upon its installation on the vehicle.

Note Always keep the battery clean. Apply grease around the battery terminals to prevent corrosion.

Warning Never remove the valve cover located on top of the cover. If the block, cover or terminals are broken or if the valve cover has been tampered with, IT IS ABSOLUTELY NECESSARY TO REPLACE THE BATTERY.

Important If the motorcycle is left unused for more than 30 days, remove the battery and store it in a safe, cool place.

Warning The battery gives off explosive gases; never cause sparks or allow naked flames near the battery. Check that during the battery charge, the area ventilation is adequate and that the ambient temperature is lower than 40 ºC (104 ºF). Do not try to open the battery: it does not require to be filled with acid or other types of fluids.

Always charge the battery before the first operation and after long storage periods - such as before selling the vehicle.

Removing the battery

Remove the seat (Removing the seat).

Remove belt (1) that retains battery (2). Loosen screw (3). Move cover (4) to reach the battery (2).

Charge system - Battery

Disconnect the battery cables first from the negative pole (5) then from the positive one (6). Remove the battery (2).

Charge system - Battery

Warning Insulate the ground cable ends you just removed to prevent them from touching the motorcycle.

Refitting the battery

Position the battery (2). Connect the positive pole by means of screw (6) by tightening it to a torque of 10 Nm +- 10%. Tighten negative pole screw (5) to a torque of 10 Nm +- 10%.

Charge system - Battery

Fit cover (4) and fix it with screw (3). Fasten the battery/cover by means of belt (1).

Charge system - Battery

See also:

 Ducati Scrambler 800 - Service manual > Rectifier-regulator

Regulator (1) is located on the front side of the airbox. The rectifier/regulator consists of an aluminium casing containing the diodes that rectify the current produced by the generator. It also contains an electronic device that regulates the current supplied by the generator in accordance with battery voltage.

 Ducati Scrambler 800 - Service manual > Topping up the electrolyte

Remove the battery (Battery). Warning Before carrying out any operations on the battery, keep in mind the safety standards (General safety rules). The electrolyte in the battery is toxic and can cause burns if it comes into contact with the skin because it contains sulphuric acid. Wear protective clothing, a face-mask and goggles when adding electrolyte. If the fluid comes into contact with the skin, wash thoroughly with fresh water. If it comes into contact with the eyes, wash thoroughly with water for 15 minutes and consult an ophthalmologist. In the event of accidental ingestion, drink large quantities of water or milk, and continue with milk of magnesia, a beaten egg or vegetable oil. Do not allow sparks, flames or any other heat source to get near the battery, as it produces explosive gases. When recharging or using the battery indoors, make sure that the room is adequately ventilated. Do not inhale the gases produced during recharging. KEEP OUT OF REACH OF CHILDREN.

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