In one position, {HEAD ~ the motor circuit} uses only the poles 47a, {TAIL ~ 47c} 
In one position , { HEAD ~ the motor circuit } uses only the poles 47a , { TAIL ~ 47c }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL