PROBLEM NEEDS ENLIGHTENMENT

I HAVE REWIRED A NEW HEADLIGHT SWITCH AND REMOVED CORROSION FROM THE BULKHEAD CONNECTOR PINS WITH VINEGAR AND A BAKING SODA [BOTH DILUTE] . THE HEADLIGHT MOTORS DO NOT RUN, ALTHOUGH THE HEADLIGHTS COME ON. IF I CHECK THE 3-PIN MOTOR PLUG ON THE PASSENGER SIDE [UNPLUGGED] THERE IS POWER ONLY IN THE DOWN POWER PIN, AND THERE IS POWER ON THE DOWN PIN ON THE DRIVER'S SIDE. THIS IS AS IT SHOULD BE. BUT, IF I PLUG THE PASS SIDE PLUG TOGETHER, THE DRIVER'S SIDE PLUG HAS POWER IN BOTH THE DOWN AND UP PIN. ANY IDEA WHERE THE SHORT MAY BE? TURNNG ON THE HEADLIGHT SWITCH , I'M NOT SURE RIGHT NOW EXCEPT THE LIGHTS LIGHT AND THE MOTORS DON'T RUN. :-(
Author: TATZ