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As for the idle, once warm, it's about 1000rpm. I started to tweak the idle screw, but I ended up hearing a bit of clattering as idle increased. I left it at about 1100 rpm for now.
It looked like 1,000 and at that idle, you WEREN'T CHARGING, you were below 12.8 volts, running off the battery.
That idle has to be high enough to NOT draw from the battery WHEN RUNNING is the bottom line.
BTW, I prefer my idle lower too but raised it just enough, just to keep a slight charge when running. Also remember, if in heavy traffic and the fan kicks on, its also pulling more current..