Question about 2006 Triumph Daytona 955i

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Overcharging battery!? I have saved so much money simply by reading. Thanks Display died, battery dead mid ride. Got home and hit the forum, found the wire by-pass, replaced the regulator myself, battery now charging. But at 17+v. I have not read anything about excess charging. I have not touched the stator. Could this be the last part of the problem? tr955i

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If it goes over 17 then there is definitely a regulator fault, regardless of what the stator is doing. The very purpose of the regulator (it 'regulates' the voltage within limits) is to NOT allow the output dc voltage to climb when the stator output rises (normal) with increased engine rpm. In other words - by nature of way it works normally, the stator AC output Voltage will rise as the engine rpm increases - it will continue to rise all the way to peak engine rpm. The Rectifier/ regulator with its double-barrel name performs two functions: the first - rectifier - converts the AC output of the Stator to DC volts - if 'UN-regulated' the DC volts would also climb proportionally to engine rpm. But that is where the second function of the Rectifier/Regulator - the Regulator - comes in. The Regulator's job is to stop the voltage rising over a certain threshold even if the stator is trying to drive it higher. It does this by 'shunting' current to ground (short circuit effectively) in a series of pulses; this controlled operation is called regulation. The limit is going to be 15V absolute max and more typically 14.5 or so. If the output rises about this value then it absolutely is NOT regulating. Failures of the regulator where they simply don't regulate and allow full voltage to pass are rare (but not impossible) - much more likely to be short or open circuit, neither or which would give the symptom you have. It still sounds almost like you maybe wired it incorrectly? The stator is inside the left crancase cover - whether or not it has its own problems, have nothing to do with the lack of regulation causing battery volts to go to 17V.

Posted on Nov 10, 2008

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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

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