Hello Friends: I have a 1950 farmall m that was converted to 12 volt with alternator and magneto dist. the tractor was running good and when I took off the magneto to try and fit a "live hyd. pump" which didn't fit. Then I put the magneto back on and tried to start the tractor back up, something seems to be grounding back and the hot wire to the solenoid on the firewall became overheated to where the wire insulation starts to melt. I have a keyed ignition and this where the overheating starts, when I turn the key to start and connect the positive to the start negative wire on the small post of the solenoid. I have attempted to bypass with jumper cables but this also causes overheating from the battery as well, the wires get so hot that the metal contact ends of the battery cables start to melt. I took this tractor to a mechanic this past summer the mechanic tuned it up, and it was running good this tractor has always started right up in any weather. When I brought the tractor home I noticed that the mechanic had not hooked up a wire coming off the harness but the tractor was running good and starting right up. The other main wire from the harness goes from the main battery terminal on the alternator, to the ammeter, to the positive battery stud on the same side as the positive cable to the battery and the battery wire from the key ignition. all the three wires are attached to the same side of the solenoid on the firewall. The disconnected wire that is coming out of the harness has an end that leads to the alternator where the female end connector is loose not connected, the other harness wire that is connected to the main battery terminal on alternator along with a smaller gauge wire that is connected to the number "2" connection on the Delco 1s0i alternator. I live in a rural area that is quite a distance from this mechanic's garage so the towing expense is $250 one way, the wiring is not that complicated but it is beyond me what is happening I am attaching a diagram that may paint a clearer picture as to what I am rambling on about. I would greatly appreciate any advice, suggestions you can give.
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couldn't get my diagram attached[/img]