Most of these had emergency opener chains put through the wall to allow the doors to be opened when the car was away from the floor. If the chain is too tight, it won''t let the lock properly engage. You did not mention how much wipe or contact area you had on the copper and carbon contacts, or the condition of the shunts, or the auxiliary contacts. The H relay should be a long core timer or a pneumatic type timer. Does the stator grid have continuity?? Inquiring minds want to know.
Johnny