Please check the that voltage is being delivered where you have added the IEC320 plug (ie at the brown and blue wires). You will need a multimeter or voltmeter to do this. If there is no power there, nothing will work of course, and if those lights on the throttle didn't come on, that's what it looks like. It could be as simple as a bad fuse in the battery. See if there is a way to get at a fuse in the battery. If there is one, usually it can be accessed from outside.

Again, without seeing it, I am guessing somewhat, but my guess is no power is coming from the battery. (the lights on the battery can still show as charged)