I was towed off the track at Barber Motorsports in Alabama Sunday. Motor just shut off and I had no electric 12V power, like the green isolator battery switch was pushed. I checked volts at the battery and had 13 volts at the battery side of the isolator unit. The isolator unit other terminal had no volts. After the car set for 30 minutes the other isolator terminal had power and the car cranked up. Has anyone else had problems with the battery isolator unit or could the problem be elsewhere?