1951 Crosley 6 volt positive ground?

I am getting ready to try and start my barn find. It has no battery in it.I am trying to find out if it was positive or negative ground. The battery cable ends arent real obvious. I am pretty sure its 6 volt. Can anyone tell me for sure?

 

Take a look at the coil wires . + to dist = pos ground,-- = neg ground.

 

Yes! Pos ground

 

6 volt

 

Dito

 

Crazy, We're trying to fire up a crosley here today too! I guess these cars are becoming popular

 

I thought you used one of those batteries for those old U-control airplanes, u know the ones that got the glowplug hot.