Parf and I did some checking (he bought a fancy fluke clamp-on ammeter) to see how much current the starter draws in our 6.2s. Both of our trucks took 650 amps to crank over, and both were warm from being driven recently. My starter is newish, only 4 months old. Glow plugs took 153 amps, but the current dropped as they heated up (we both have a set of 60Gs). As a side note, the ford powerstroke that hangs around the house took 710 amps to start and 160 amps for the glow plugs. The 600 watt amp in my Bug took 70 amps peak, about 45 amps average. Maybe we will be able to see how much current it takes to crank over a 6.2 on a cold morning before winter is over. I'm guessing it will be around 900 amps.