They have separate instructions for Street Glide models versus bikes that came with a Tour-Pak standard. And you will need to buy an extra extension harness, which you don't find out until you dig into the instructions.
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a.Unplug the six-way vehicle harness connector [C7] under the seat: FLHX, FLHXS, FLHXSE, FLTRX, FLTRXS models: Next to the Electronic Control Module (ECM). FLHR, FLHRSE models: Top front of rear fender.
b.Plug the six-way spoiler harness connectors into connector halves [C7A] and [C7B].
c.Insert the extension harness (Part No. 69201157, purchased separately) into the spoiler auxiliary lighting wire harness (11).
d.Route the extension harness along the left frame tube. Plug the spoiler connector into the extension harness.
8.Secure wiring with cable straps (12) as needed.
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If you don't have that extension harness, I can see why you're having problems. The new way Harley does instruction sheets sucks, IMHO. They need clearer instructions and better illustrations. I don't know how I could talk you through this, since I don't have a similar bike I can look at. Just start out by finding that 6 way black connector near the ECM, that is the connector for the rear lighting. You will need that extension harness and the little Y harness that comes in the kit, item #11 in the diagram I posted previously. Once you have all those in hand it should become much more obvious.
Jerry