B&M lock-up controller 700r4 & cross member question

[i heart square bodys]

okay im having some slight issues here. im in the middle of swapping from a th350c to a 700r4 in my '86. the tranny is an 88 trans out of a truck. i have converted it from electric speedo to mechanical. i bought one of those B&M lock up controllers for it and the instructions are good to say the least. i am having issues with the 4 prong plug in the side. when i look down inside it on the tranny there are 3 connectors in the plug out of the 4 prongs, but inside the plug that came with the kit there are only two connectors(for prong A & D), there is a provision for another connector, whats the deal with this? do i just plug it in and hook up the 2 wires (supply and ground) ? or is there something i have to do with this third prong(prong B)?

now for the crossmember... do i have to drill new holes in the frame for this ? it is kind of looking that way to me but i thought id ask anyone with experience.
thanks to anyone that can help !

here are the instructions for the controller http://static.summitracing.com/globa.../bmm-70244.pdf

[clinebarger]

Wire it the way the instructions say to.

Should not have to drill holes in a '86.

[i heart square bodys]

so dis regard B ? and maybe a stupid question but shouldnt the brake light switch supply power ? not cut it ?

[motornut]

Originally Posted by i heart square bodys

so dis regard B ? and maybe a stupid question but shouldnt the brake light switch supply power ? not cut it ?

cause you want the lock up off when using the brakes

[i heart square bodys]

So the brake light switch cuts power to the trans?
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[clinebarger]

Originally Posted by i heart square bodys

So the brake light switch cuts power to the trans?
Posted via Mobile Device

The TCC side of the brake switch will, The brake light side of the switch is opposite.

[i heart square bodys]

ahhh okay i think i understand everything here now ! thanks guys sorry to me a major pain in the ass lol come to think of it now that i know how this works i likely could have made my own lock up switch