HELP fusable link dies while driving

A short will not care if the alternator is in circuit or not unless the alternator is at fault; the battery will supply the power to blow the link if there is short other than the alternator. A developing short may have caused the prior alternator to fail.

The good news is that it sounds like you have a hard short so this will be easier to trace. You're on the right kond of track track, to start disconnecting things one at a time starting with the alternator 'til it does not blow. I would advise you to replace the link for now with an inline blade type fuseholder with maybe a 20A fuse and then retry. Changing fuses is a lot better than changing links, and will protect things better as you find this short.

Do you have a wiring digaram downloaded and can you read it OK? That is your best roadmap to troubleshooting this.