69's have three wires due to the fact that they have plastic tail lamp housings unlike 67-68 which have metal housings providing the ground.
I just took a couple apart.
there is a catch on the female half of the spade seen
HERE
You have to slide down the inside of the ground connection and depress the spring "tongue" which has the lock.
And press the "tongue" with the tip of a screwdriver or a dental pick, this will allow the ground to come off...
The other connection is removed by sliding the removal tool down the inside from the front- there is a recessed slot- then after the tang is depressed the two spring connections for the bottom of the bulb will slide out the back.