Quote:
Originally Posted by IrlMike
For this high voltage to occur - likely just intermittant - there would maybe have to be two problems. First the alternator regulator would have to 'glitch' or possibly the 'sensing' (brown wire) connection (from ign sw) momentarily break, causing the regulator to give max alternator output voltage. The second problem is that the battery + or - (earth) connection (to alternator output) must be poor at the same time, otherwise the the battery itself would not allow an eccessive voltage rise. Assuming the battery is good & starting the bike ok, I would start looking at the fuse box for this poor connection, where the alternator output/main circuit feed brances off to charge the battery.
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I was thinking of perhaps a non-conductive spot on the slip rings -- perhaps corroded or oxidized -- where the system would see zero output from the alternator and apply excess voltage to the rotor. When the bad spot was passed there would be a voltage spike from the alternator and perhaps a 'ringing' effect depending upon the duration of the bad spot and the slew rate of the regulator.
This would be repetative and over time would cause more damage than the occasional random voltage spike.
The battery should absorb the spike but it would depend on the magnitude of the spike and the power dissipation capability of the voltage regulator in the ignitor box.
A broken or stuck alternator brush could cause the same effect if there is a bit of eccentricity to the slip rings.
It could also be an intermittant connection in the voltage regulator itself. Perhaps bad solder or a broken lead.
So that's two possible problem areas to look at.
Jim
