I just changed the fuel filter in my truck. I took the air intake manifold off and then went through the wheel well. Problem is the first part of this repair job started a month ago, then the weather got nice for riding so the truck sat. Now I'm putting her back together and I can't figure out where this wire coupling hooks up. It's got 3 wires (brown or orange) coming into a flat coupler with a hole through it, so it bolts to something. What?