My father in law got a 78 xs400-2e last week and i finally got it all cleaned up and running so i thought.  It blew a headlight fuse and a main fuse.  So i went over today and started doing some checking and found that if i do a ohms resistance test on the fuse box from the ground to the fuse block im getting no resistance anywhere meaning that i have a problem with a bare wire somewhere right?  well i pulled most every part of the wiring harness out today and found nothing that looked bad.  has anyone else had this problem?  if so what did you find?  I only had a little cheap tester there today i didnt have mine so ill take it back when i go over there thursday to look at it some more.  I even pulled the head light to make sure everything was ok in the headlight bucket.