Just picked up a pretty solid '54 851 gasser with a few TLC problems. Has a 5 speed, PS, and a Wagner step-thru loader. It had just been drug out of a barn, and has a 12v battery stuck in it, isn't this tractor 6V pos ground? Still has the original generator on it. Tempted to go alt conversion, doesn't have lights so fairly easy. Also, there is a valve under the gas tank, and a petcock at the carb. No flow from the line, the valve under the tank has a screwdriver flange, is this original? I have turned the tank valve both directions and tried to blow back through it, no flow. Am I doing something wrong or?