This gets even more interesting. I noticed all the voltages at pins 1, 2, and 3 of the op amp were oscillating with a regular period. My scope isn't working so I couldn't take any measurements on frequency and voltage swings. Anyway I was probing a few other voltages when I accidentally shorted either pins 5 and 6 or 4 and 5 on the op amp. There was a release of magic smoke and the scent of burnt electronics. I gave a fast glance and didn't see anything fry so near as I figured the smoke release came from the LM324. I was about to cuss it out and call it a night when I noticed the supply was putting out 13.8v. Voltage measurements at Q1 and 3 of the 4 op amps were completely normal. I threw increasing resistive loads on it. I got to a 5A draw when I noticed the voltage dropped to 13.4v. Pins 5,6,7 look to be part of the metering circuit so I can't quite understand why an accident short and release of smoke there would do anything. So this is perplexing. Why did an accidental short "fix" the output voltage, what did I really fry, and how well is it regulating with a .4v drop at a 5a draw?