I had my 1953 3100 running and it sat for a while. I went to go start it the other day and the engine would crank but it wouldn't crank over. I figured the battery needed to get charged and put it on the charger. Now, when I put the battery back in the truck the volt gauge goes to 10 volts when the key is on. When I press the floor starter pedal the volts drop to 0 and the engine doesn't even crank. I have no idea what happened between taking the battery out to charge and trying to start it. Any help would be appreciated.