When I did my handle bar install I had same problem. I knew exactly what was causing the problem because of the trouble I had with the little green connector in the handle bar. Yes it was the little green connector in the handle bar that came apart just a little.
Double check all your connections and try to start as soon as you get your handle bar controls & ignition back on.
2010 FLTRX , Stage 1, 13" Madstad, Mono tubes, SuperShox, Heritage style bars. Alpine CDE-HD149BT,Soundstream Picasso Nano Series PN4.520 , 5X7 and 6.5 Infinity Kappa speakers
If I have to explain ,you wouldn't under stand anyway.