I do understand, doggy.
Would make more sense to simply kill power if it exceeds the input limit, though (which I think is a more normal design these days. Saves wiring.)
OP said he was using a 3 Amp fuse, and it blew. There was a reason for that (wrong fuse). Get things set up right, then start troubleshooting. That was all I was saying.
If the fuse blew with the VHF off, I'd carefully check wiring after the fuse but before the radio. The current that blew the fuse had to be going somewhere.