I did the exact same thing - got impatient and flicked the charger to 12 amps then hit the starter button.
Lights come on strong, and the green Neutral indicator light dims slightly when I press the starter button, but the starter doesn't turn.
The fuses under the seat seem to be fine, and I swapped 2 of them with spare but I don't recall which ones (but if 'main' or 'turn signals' fuse was bad, I'd not have lights/horn, right?
This is a 1996 Trident. Sorry, wrong forum technically but this is my exact problem, w/o the happy ending the original poster had.
Should 'solenoid' be my next place to check? I'm not a mechanic and my closest dealer is far away

I don't see any in-line fuses that could be blown.