Question about 2002 Ducati Monster 900 i.e.
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???
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.
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Posted on Dec 23, 2008
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