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You sound as frustrated as the rest of us were when this happened to us. It most likely isn't going to be something weird or obscure it is going to be something simple. Genos idea of having someone else look and trace the wires would help. This isn't difficult but time consuming and very frustrating.
From personal experience I know that in the course of reinstalling the wire/sockets into the Deutsch connector an individual wire may be secure in the primary lock only to be slightly twisted by the further assembly of other wires and become loose after previously being secure. Once loose, it will likely not make electrical contact when the connectors are plugged back together.
Checking for loose wires is pretty simple; the wires for the audio are in sockets 5,8,9 and 10; the cruise wires are sockets 1,11, and 12 in the handlebar Deutsch connector. Gently tug/pullon the wires; if they are locked in the Deutsch connectors they will pull out of the connector.
If the audio and cruise switches were working before dissassembly, it is unlikely that both switches failed--so the problem more than likely is in the reassembly of the Deutsch connector, IMHO.
Also, the wire colors of the handlebar Deutsch connector should match the wire colors in the interconnect harness into which it is plugged.
It is very easy to break the primary locks that secure the individual wires in the Deutsch connector--I know, I have done it--and it may not be obvious to a visual inspection.
But as others have said, more than likely the problem is notobscure--it's simply that the reassembled handlebar Deutsch connector wires are either in the wrong socket or improperly installed without making electrical contact with their corresponding wires (so they are not completing the circuit) in the interconnect socket.
Good luck with the fix and dealing with the frustration.
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