If the coils are from the original winding they may be faulty with shorted turns, I assumed that you had wound them recently.
If you prove these coils to be faulty and wish to use it with the 2 good pairs, you will do better to remove the dead coils completely, they will absorb power.
Flux[ Parent ]
"New Idea Makes Box Fan Conversion Very Easy"
http://www.fieldlines.com/story/2005/7/4/34446/17324
Thanks a million!
G-[ Parent ]