I'll bet that you have less than 1/4 tank of gas when this happens right? The tank baffles are broken and the fuel sloshes to one side. Fuel pump sucks air and the engine stalls from fuel starvation. Replace the tank or keep it above 1/4 tank.
Can you tell somehow how many volts it's putting into the battery,is the alternator actually putting out a charge?.Yes, I know that problem well. I never let it get below 2 gallons and it is okay. The problem is different in that the battery goes dead and cant restart unless I jump it.
I agree,I just thought by the process of elimination he could determine if the battery is receiving a charge or not,maybe theres more than one thing going on.I can't imagine a battery or alternator problem happening only on turns. Why would you not clamp the battery down? If your scenario was correct, you'd be shorting the battery. There would be sparks and you'd likely blow fuses and have all sorts of problems.