Question about 2002 Ducati Monster 900 i.e.

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Melting rectifier on ducati 900 ss

Rode bike and noticed batt light on, battery is a cheap one so wasnt concered maybe running a little flat. after a while the bike had a burning tar type smell and i noticed moulten sticky black liquid coming from recifier. batt was flat and would not turn motor over to restart. apparently a common problem on duke and harleys. i am wanting to know what would have caused this??? what to start looking for???

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  • Anonymous Mar 31, 2014

    Bike is in great shape good compretiontoo. Problem is all my wires were hanging lose when I got it,and I had to figure them out myself.I'm pretty good at this but not good enough evidently. There is one plug ,it looks pretty crusal that I can't find a plug in for.its almost oval but has one flat end. Pls help

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Hi and welcome to FixYa,

Offhand, it is a known/common failure of the regulator. This is especially so for those models with 2 phase alternators (2 yellow wires). The charging current is shared by only 4 diodes (rectifier). I have replaced in my 907 with 3 phase (3 yellow wires) effectively increasing the diodes to 6 thereby distributing the current and lessen the heat build-up. The charging also improved as noted by brighter headlights. In the 907, the yellow wires passes on the left side of the bike from the regulator to the engine. There are also connectors along the way that gets corroded.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 23, 2008

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