Check where the gray wires plugged into the LPS spade go. When GM added an option that needed power from one of those terminals, their harness is split into two wires, one to the option they are powering and the other wire a tap with a connector on it, thus allowing another option to be plugged into that source. Check out this clock harness and you can see the taps off the orange and gray wires. The clock needs 24/7 (orange to the Bat) to run the clock and lamps power (gray to the Lps) to light up the clock when the light switch is on.