Now this is going to sound like some kind of joke but.... you are lucky you have a 'hard' short (Easy Boys!). What that means is that you have a short that is continuous rather than intermittent; that will make it one million time easier to find the problem than a short that 'comes and goes'.
You can pick up an automotive breaker so you can keep breaking the breaker while you search for the short, or pick up a box of fuses- either way, you <may> have to go through a bunch of iterations to find the problem. Still, this is really a benefit to you in diagnostics.
I would suggest removing the starter cable and then replacing the main fuse (or insert a breaker). If it does NOT open, you have isolated your problem to either the starter or something on the power side of the starter circuit. If it does open the fuse or breaker, start disconnecting the fuse boxes under the seat, or pull all the fuses in one box at a time, then try a new fuse (or reset the breaker). Keep going until it either will not open an fuse, and that means you have located the problem area, or it it continues, you will have to trace the power feeders to each fuse box for chafing nad where they might be shorting to ground. Again, in all seriousness, you have the benifit of a hard, certain short, which will show you exactly what the problem is if you keep looking. It sounds worse than it is; there are just not that many circuits on a C-14 and you will find it if you keep looking.
Best of luck but I believe you will find the problem. Then fix the problem, then ride the bike with the certainty that you HAVE found and ELIMINATED the problem. It is far worse when an electrical problem comes and goes for no obvious reason and you think you fixed it 29 times only to find you did not..... when a long way from home :-(
Brian
That fuse blew right away. Got all sparky when I went to attach the ground cable. This would be fun if it didn't suck.