I can't find any reported problem exactly like this, so I'm starting a new thread. I've executed all of the test procedures in other posts and found that with the ignition off, I have a .4ma (.0004a) drain from my radio, which I can live with; otherwise, the drain is not measurable.

The problem is that while I have 13.86v at the battery, my voltage gauge only shows 12-12.5v at the same time at any engine speed. As above, leaving the car unattended isn't the problem - driving the car for 20 minutes or so drains the battery completely, even though it appears that the charging circuit is working. Turning the lights on drops the voltage meter reading to less than 8v, but then it comes up to 12v at highway speed. I seem to recall that the meter used to read 13.5 or so at highway speed and 12.5 at idle or around town last season.

I'm going to clean and re-seat every ground that I can find. Any other ideas?