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Originally Posted by andyb
When the bike is idleing I am getting 13.7V DC across the battery terminals. When increasing to 5000rpm the value decreases to 12.88V. Both of these values are when the battery is under load with all lights on. The battery voltage is 12V before the bike was started as I dont want to put the new battery in and knacker that one too, could this be the problem?
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This happens on my '99 as well. I had some charging problems a couple of years ago, and when I measured the charging voltage I concluded that the RR was to blame. Bought a new one and got the same result. Checked the AC-voltages and regulator/rectifier as specified by the manual, everything checked out OK. I tracked down several bad connections and corroded terminals in the wiring loom and sorted those out. The battery would now hold a charge, but charging voltage is still the same.
At idle it's around 14V, which decreases to about 12.8 when I rev the engine. I can actually see the lights dim a bit when I rev it. Maybe it's supposed to be like this, but it's a bit annoying to have to hook my "new" bike up to a charger every week just to keep the battery happy. When I got everything else sorted out I'll look for a better quality RR.