Posted by tgemignani on March 28, 2013 at 08:24:23 from (204.77.163.4):
I was recently gifted a Ford 640 tractor. Pulled it off the trailer and the battery was dead. I purchased a new 6v battery and connected it to the tractor, positive going to the right side (passenger) and negative to the left (driver). The tractor cranked right up and was driveable but obviously wasn't reaching it's full potential as backfiring occurred at higher RPM's. I pulled the tractor into the barn and backed off the throttle to Idle whereupon it died. The weather turned colder and I wanted to go plow the driveway but could not get the 640 started no matter what I tried, plenty of fuel was flowing through both the filter and the carb (checked the drain plug on the carb).
I assumed it was a coil or spark issue so I purchased a new coil from Tractor supply. I wired the coil with the positive going towards the rear of the tractor (ground?) and the negative going to the distributor. This seems correct to me in a positive ground situation as the negative is the hot lead. When hooking up the coil the darn ground (rear) wire broke apart due to age so I stripped the end of the lead off for testing, I was able to get short bursts of spark but tapping the positive lead on the coil with the stripped wire and the tractor fired! My issue is that now I get no spark when touching the coil and the tractor refuses to start again. I have no idea if the coil is wired properly because every post I read says something different in regards to positive or negative ground situations.
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