Positive or Negitive ground?

Going to look at a 1955 Super 88 and a 1956 Super 77 this weekend! Both are diesels with 12 volt systems with lever start, no key. I have to bring battery with and was wondering if they are positive or negative ground? Owner has passed away and widow does not have manuals.
 
They were originally 12v Positive ground with a generator but if converted to an alternator they are probably negative ground.
 

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