Have a W4 and an H tractor ( both were grandpa's).  Put away about 20 years ago, ran OK when they were put in the shed.  Took batteries out before putting them away.  Pulled them out of the shed today to get them running again to sell. I believe they are +positive ground when hooking up the battery but can't remember for sure.  Haven't been on them for 20 years or so.  Tractors sure have come a long way.  Spent lots of time on them back in the day - I must have been quite a man back then - when did I turn into a wimp?  So the question is - are they positive or negative ground.

 Thanks..... Whipper