Last week one of my twin 125s over heated, shut down unit to let cool. When I tried to restart neither unit would turn over (starter didn't spin). Ran new plug wires topped off batteries and installed spare solenoid on right unit. Neither unit will still spin starter. Starter will spin by jumping solenoid, what are odds 3 units go bad all at the same time. Lights, tilt, choke and everything else working fine. Just dead in the water. PS will any auto solenoid substitute for force unit for testing.