Got a Jakes Black box and need some help.

There are two wires--pink and brown--I believe the pink comes from a split on the ignition source to the lock up switch and the brown also comes to the switch to engage the lock up. Not sire where this set up gets grounded--anyone?

 

The pink wire is for all the solenoids, not just the lockup solenoid. If you don't hook it up, it won't shift.

As far as where, any good ground should work (ground it to activate lockup).