Question about 2002 Ducati Monster 900 i.e.

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Regulator rectifier Hey all. I have an '01 M900Si.e. with a little electrical trouble. Seems my battery continues to eat it. Now

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I've used the search function with several variables with no concrete success and my Haynes manual only covers the single-phase regulator rectifiers. Here's what I got: -Charge the battery wait 30 minutes after disconnecting and it shows good volts. -Disconnect the ground (-) terminal and check the draw with all systems off 0.6mA. That's a bit higher than I'd like but not horrible. Disconnecting the ECU fuse it drops to nil. -Reconnect and run the engine at idle the volts across the battery show right about 12. -Increase RPM to 3000 and the volts steady a bit but still remain at 12. Everyone seems to think that stators rarely fail on these machines, but I'd like to be certain before I drop $80 or more on the regulator/rectifier. Anybody out there got a good idea?,Battery voltage at the battery should stabilize at aroun 14V, not 12V. The battery should be at about 12.5 when left overnight. My ST2 will hit 14V at 2k RPM with no lights, 3lk with low beams, 4k lo+hi.,,,

Posted on Nov 10, 2008

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1993 Vmax. Why is regulator/rectifier overheating?


You are not going to like this answer but here goes. All Motorcycles, mopeds, scooters, quads, etc, that have have a stator to regulator/rectifier to battery generating system all have the same design flaw. They all have lousey electrical connectors. Heres what happens: the stator produces 204-220 volt ac current. The same thing that will run an electric dryer in your home. It's a lot of power. That power gets changed to dc current by the recifier and converted into about 15 volts by the regulator in the same unit. That's a lot of heat energy. If at any time the electrical connections become compromised by vibration, oxidation, dampness, salt, or dirt...you will see the wires fry. It's an over load...not a short. Power sports shops are well aware of this and are happy to charge you list price to replace the entire system for several hundred dollars. Usually between $800-$1000. You can get after market sets of the component parts and do it yourself and that's the only way I know of to avoid the cost & it still ain't cheap. Many moto-X riders replace the connectors with automotive plugs that seal out water, dust, etc with a recessed plug with a silicon gasket and seal it with dielectric grease to prevent oxidation. Like the plugs on a car's O2 sensors. Hope this has been helpful, Sorry to be the bearer of bad news.

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The bike probably has a faulty charging system. Need to check regulator/rectifier for proper operation as well as the stator's output voltage on all 3 phases. They usually blow out the regulator though.

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Your Voltage should never get that high. Anything over 15volts is bad news. Try Testing your Regulator. First do a Bleed Test.
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Early Suzukis had consistent charging problems, resulting in run-down batteries, short battery life, hard starting and frequent stator and regulator/rectifier replacement. Some of the problem is due to poor quantity or corroded electrical connectors, some to a poor ground to the regulator/rectifier and some just poor quality components or design. Keeping the connectors on the three stator wires clean and by running a heavy ground wire directly from the negative terminal of the battery to the regulator/rectifier mounting bolt will help.
You can download the GR650 manual here - just look for the tiny "Save file to your PC: click here" at the bottom right of the page.

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1 Answer

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http://www.jacksons-lair.co.uk/repairs.html

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