Won't start

[andrewwynn]

I believe two functions going on: I think this starter uses magnet to engage the drive pinion vs. just helix. If the ground not solid for the coil but is for the motor you'll get a spin no engagement.

I could be wrong on the starter engagement, and if it is just helical gear engagement, if the voltage is not high enough you could get your symptom.

Check your B+ jump terminal. If that gets loose it can cause you symptoms.