Following Aaron Cake's writeup, this jumper is skipped in Step 22. But I read elsewhere that it is required to make some of the outputs work. I searched all over this forum and saw no mention of it being required.

Finished building a V3 MS2 w/Zeal and boost control mod. Both S12 and S12C were take by these two add ons.

 

I'd wire it in. The stepper controller can get hot if you try to use it to drive relays and the S12c jumper isn't wired.

Ken

 

Thanks, wired it in today.