Hey everyone just trying to find some info. My cousin has a 1947 Desoto sedan 2dr with a straight 6 flat head with a 6 volts system reverse polarity. We need a wiring diagram.we have no spark at the moment and if you wiggle some wires it start cranking by it self. Any information would help thank you all.

 

They can provide one:

http://www.ynzyesterdaysparts.com/