OK , THEN FOR THE FIRTS TIME IN CAR HISTORY i'M GONNA MAKE THIS SUBJECT SIMPLE!!!!!!!!!!!!!
no kidding never found even once a simple explanation!!!
On my car 85 transam with the TH700R4 I have the original wiring that's coming out of the tranny for the lock -up , it's a 3 wires . On my car I had color purple , blue and brown/black . A is the 12V , B and D the two others . So I hooked the purple to 12V key source, and blue and brown/black hooked together and both to ground.
Now depending on your tranny you could have different switches . mine was locking then an all gears wich was anoying so I grabed a fog-light switch and hooked those wires on so I could lock manualy on overdrive only. And now my lock-up works perfectly.