Posted by 2510Paul on February 08, 2016 at 10:39:16 from (207.118.233.112):
In Reply to: 1969 John 4020 posted by walkertimothy7 on February 08, 2016 at 10:19:17:
Tim, I am going to go out on a limb here. After reading your symptoms several times, I am thinking you have a loose or shorting wire someplace. It could even be internal to the batter(s). Something is loose, the hard cranking when hot leads me to the batteries first. Also, could the batteries be shifting and a post shorting out. I say start simple, batteries first, then on to the wiring.
I cannot comment on the pump idea, someone else more into pumps will have to comment. Then again if the pump has an electric shutoff, inspect that.
I don't know the condition of your wiring but I worked on a 1967 4020 a couple years ago and the wiring was literally rotten. It did not take much convincing for the owner to buy a whole new harness from AgriServices.
By the way I had a similar issue on a garden tractor once. We looked and looked, finally it was a wire that rubbed through the insulation and only shorted when going up hill. I just had to mow it all downhill bothways, NOT. (-:
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