1. I happen to be looking through my Bently wiring diagrams right now
  (working on my Digifant diag. tool), there is a 5 amp fuse shown on
pg.
  97.105 on the left side of the page.  It appears to be for the heating

  element for the rank case vent, at least that what I think "HTG ELMNT
  (CRKCASE VENT)" means.

  2. The single brown wire goes to one of the oil pressure switches I
  believe.

  dave
  www.251.org