Starter relay wiring
For others, on an engine stand probably easier to use a standard automotive 40 A relay. Two terminals for coil (86 to 85, or vice-versa check polarity), two terminals for the "switch" (30 to 87). Chrysler started using those when they changed to the underhood fuse/relay box (ex. my 1996 Voyager). For neutral-safety, they just route coil- to the NSS.