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The battery may not be holding a charge or have a bad or weak cell. I will assume that the 12.6 volts given was checked while the engine was running. My car uses a Alternator instead of a Generator. However, I believe that this is what yours should be doing.
The switch on voltage at the regulator is 12.4-13.1 V
The regulator voltage at idle No load 13.5-14.5 volts Load 12.8-13.8volts
You might also check the fan belt for correct tension.
To polarize the generator connect the battery lead for 5-15 seconds to the terminal 61/D+ on the regulator.
If you have your lights and radio on. The generator light will also be on or flicker at idle. That is too much of a load for the light to go completely out. The Generator is just not producing enough voltage at lower rpm. It might also stay on until after the 2000 rpm. That is why I have an alternator.
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