Ever since the Volt Reg left me dead on the coldest day this past winter, I've been watching the ammeter like a hawk. I bought a $10 cheapie from Advance to get me running and it failed on the next coldest day (week or two later). So I went and bought a $46 NAPA unit which worked great for 3-4 months. First the ammeter needle started bouncing, then it indicated massive charge (full peg) all the time. I heard a hissing sound and thought it was the radiator cap, but it was the battery caps!!! It was overcharging the battery and the walls of the battery were bulging. WTF? The NAPA guys tested at 20V out!!! Should I be looking for something else....short? The alternator was replaced along with the first VR (NAPA unit, 63A).