The primary winding is energized across the first lead and the second lead and {HEAD ~ the secondary winding} is energized across the second lead and {TAIL ~ the third lead} 
is energized across
The primary winding is energized across the first lead and the second lead and { HEAD ~ the secondary winding } is energized across the second lead and { TAIL ~ the third lead }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL