"So you have cut wires - if th
"So you have cut wires - if they can be reattached (enough left after the cut) they can be put back together - I would solder the connections and cover with heat shrink tubing.
Why did the trigger wires burn - they got too hot.
So either the motor overheated to the point where the casing melted, or due to over voltage, they over heated and melted the wire.
In any case you could be in for a total replacement of the stator and trigger.
What could have caused this - here's a guess.
Your retifier fried because maybe the battery wasn't hooked up or had a loose connection. And someone figured by simply clipping the yellow wires that would help (wrong).
Or for whatever reason they clipped the yellow wires and ran the motor. That caused excess voltage in the charge portion of the stator which overheated it and possibly fried the trigger and maybe the stator as well and if my scenario is correct you will need a new stator, trigger and rectifier.
For that model you would be looking at a few hundred bucks. The original stator is no longer available, so you you would need a red stator plus the retrofit kit (300-400 bucks if I remember correctly), plus new trigger (150 maybe) and 35 bucks for a new rectifier.
Those four yellow wires, if not being used, still needed to be (isolated) to the engine block.
A 35 dollar manual could have saved countless hundreds if whoever clipped those would have bothered to read first and snip later...."