I have just replaced my bars, I had a myriad of learning experiences. I will share, you see if it helps.
1. under the seat, there two connector sets (grey and black in color) that must get reconnected when reconnecting your battery. my black connector set fell below the frame rail when removing the ECM tray. I forgot I disconnected 2 connectors....lol. it effected the dash lights.
2. crushed wire harness on left with clutch handle mount, clamp halves, wire harness not sitting in that sweet spot groove.
3. see number 2 above, I did the same to right side.
4. if TBW is damaged, one side effect is cruise control will engage with a green indicator, but will not set speed, part of safe mode operation. so left and right side controls do function together or atleast monitor.
5. a lot of low voltage (amps) variances that are changing in the handle bar harness assembly during operation of the bike, with throttle twist. a flat spot in a wire, a broken wire shielding, or a small slip of a connector pin in a plug. can cause those issues.
I recommend looking everything over, touch connectors make sure they are seated, disconnect battery cables, when doing tear down. make sure handle bar wiring bundles have some free movement, and not pulling tightly and connection points (mainly inner fairing area).
I believe power enters at the tray inside the lower inner fairing, where the two left side controls plugs get connected as well as the right side. re-check all connectors in that tray area.
green connector in the TBW got me, on removal from the OEM bars.
hope this helps.
Dan