You do not need to attach the throttle
...pic...

what its for?
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=629742&page=1

a pipe plug will work for your manifold


Key off position, Batt post should read voltage.. your other two post should read no voltage.
is it original ingnition?