connector C100 and C153 pin labeled "Ignition 3 Voltage??

[mrhurt73]

does anybody know what this circuit does?

my harness is from a 2001 GMC 5.3 and it has brown wires called "ignition 3 voltage" according to wiring charts, one was in C100 pin n and other C153 pin c.

traced wires out and it ends up on a small black 2 pin connector that i dont remember being hooked up. the other wire off the 2 pin connector seems to hook to a common ground splice.

can i just delete this whole circuit?