Posted by ogreafmc on April 25, 2022 at 08:00:16 from (173.88.68.124):
New to the forum, so I appreciate any guidance. I am helping a family member repair the electrical system on their TO-30. It has a + ground, 12v system. When I first started working on this tractor, it was set up as a + ground. The entire wiring harness was deteriorated, so I have replaced it. New harness, resistor block, ignition switch, coil, points and condenser. I set up the battery with - ground, and the tractor would not start. No spark whatsoever. Switched back to + ground and the tractor started and ran beautifully. After turning it off (using the ignition switch), I started to smell an electrical odor. Found that the female blade insulation on one of the wires to the resistor block was melting (from the resistor block to the ampmeter), and the resistor block was extremely hot. I used glenmorebuckman's diagram (05-16-2021) as a guide, minus the #1 wire from the alternator to "I" on the keyswitch. The #2 wire from the alternator goes to one side of a resistor block (from TSC), and then from the other side of the resistor block to the amp meter. The coil (also from TSC) is a 6v, but states it can be used for 12v with an external resistor. Pretty sure I missed something pretty basic, but not seeing it.
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