On my BB 72 the vac. contol for ( I think the wipers) is attached to nothing but the electrical connection (a 2 wire blue and lt gray plug in) It appears to have one vac line in and 2 out. but mine is connected to "nodda". I can see no obvious places it should connect and a vac. diagram provides no help. My wipers don't want to properly park and it hads been suggusted that this little critter might be the problem. Anyone care to assist?