GGG posted:Just because wires not touching each other doesn't mean you can't have damaged insulation on the red wire that is sparking to chassis or truck. So re inspect wires.
2nd needs to go to a Tech. Continued running can damage board beyond repair, so be careful.
Third one needs wheels cleaned, pickups, lubrication. Test again. G
You think they might need some new shrink tube over the solder joints?