I have a 1957 Ford Thunderbird 312 automatic. Sometimes when I go to start it up it acts as if there is no power (current) going to the starter from the battery. Only the oil light comes on to show that there is a connection. A couple of hours later; or perhaps the next day I can turn the key and it cranks right up. I suspect that this might have to do with the neutral safety switch. The battery cables are tight. Does anyone else have any idea?