After reading extensively on here about the wiring harness I still can not find the wires under the rear of the trike. So either I am looking in the wrong spot or the builder did not put them on the bike. So my question is what do I need to buy and how do I install it? I am picking up a tag a long this weekend and it has a 4 plug with a 5-4 converter. Any help is greatly greatly appreciated. TIA !!!!!!!!!!!