1947 Desoto
 

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. :)

wiring diagram
 

They can provide one:

http://www.ynzyesterdaysparts.com/