Tim G. Red hot wires
Usally wires get red hot when the source is directly shorted to ground. Looking at the drawing Kraig posted, I would check for a chaffed wire(s) starting at the starter switch to the Volt regulator then to the ignition switch and then to the coil. The ignition switch could be the culprit, if it is grounding the current to frame through the case. Isolateing it from the frame would check this. If you have a volt/multimeter with ohms/continuty check this will help in hunting down chaffted wires. If the "burning" wires are the same color as in the drawing then which ones are red hot? This will help point to the problem. It is also possible the coil or volt regulator are damaged.
Usally wires get red hot when the source is directly shorted to ground. Looking at the drawing Kraig posted, I would check for a chaffed wire(s) starting at the starter switch to the Volt regulator then to the ignition switch and then to the coil. The ignition switch could be the culprit, if it is grounding the current to frame through the case. Isolateing it from the frame would check this. If you have a volt/multimeter with ohms/continuty check this will help in hunting down chaffted wires. If the "burning" wires are the same color as in the drawing then which ones are red hot? This will help point to the problem. It is also possible the coil or volt regulator are damaged.