I've got a question regarding wiring for the Tekshona P3 aftermarket brake controller to work with the electric over hydraulic brakes. I know I can "fool" the system using brake magnets, but I'd also like to understand the process to wire in the P3 if I want to.

I have a copy of the latest GM Service bulletin which replaces Bulletin 07-08-45-001 telling how to instal the aftermarket controller.

I'm having problems with the following paragraph in the instructions:

Locate connector X126 (on vehicles with RPO JF3 or JF7) or X115 (on vehicles with JL4) near the Underhood Fuse Block (Refer to SI Document ID# 1849049).

Circuit 47 from the blunt cut wires near the data link connector will end at connector X126 terminal "G" or X15 terminal "B5". Obtain enough Dark Blue 12 gauge wire to run from X126/X115 to the 7-way trailer connector at the bumper. On one end of the Dark Blue wire attach terminal part number 15304732, located in Delphi Tray 8 and insert into X126 "G", or terminal part number 15304720 located in Delphi Tray 19 and insert into X115 "B5". Run the Dark Blue wire in its own conduit along the frame to the 7-way trailer connector at the bumper. Remove circuit 47 from the 7-way trailer connector terminal "C" and tape the bare terminal and attach to the harness. Attach terminal part number 12110853, located in Delphi Tray 4, to the other end of the Dark Blue wire and insert it into the 7-way trailer connector terminal "C".

Would someone mind either posting a picture, or accurately describe the position of, and how to recognise, the X126 or X115 connector???

And what is "Delphi Tray 8", "Delphi Tray 19", and Delphi Tray 4???

Better still, if someone has actually done the procedure, could we have some detailed instructions and/or pics please.

Thanks In Advance.