This is the original Deluxe that was installed in the truck
when it was delivered in '50, according to the original owner.
Back about 6 or 7 years ago I turned the commutator and
installed new brushes in the original motor. as you can
see, the original motor had a ground wire also and was
not simply grounded thru the case.
http://www.pbase.com/dennygraham/image/121512986/largeThere are also some pictures of the internals Marko, look
thru them and maybe you can figure out where your wires
are missing.
DG