Help - No electrical power at all (67 Barracuda)

Ok - after becoming an acrobat to find and test wires, it appears that the Ammeter is good. The prior owners wiring is interesting. The fusible link goes into "Y" not "Z" on the drawing. I don't think this is an issue. The cabin side bulkhead connector does not have a red wire coming out. In the "y" spot is a blue wire that splits out to a 3 ways. 2 rat tails with female terminals (one which is shows 12.5v). The 3rd gets taped up in this mass of wires that goes up under the dash. Somewhere in the taped up mess a red wire comes out to the ammeter. The red wire is dead but I touched the black ammeter wire to the live blue female off the bulkhead and I have power (the dome light). I've got to assume the wire mess where blue goes to red is the culprit here. Just a thought. If I am ok living without the ammeter can't I just pull the fusible link out of the engine bay bulkhead connector and splice it into the black line running to the alternator? Theoretically, I'd only be cutting out the red wire from bulkhead to ammeter. Is this dangerous? I'm trying to avoid playing around in the taped up wired mess. The accessibility and my skill level are not in my favor here. Also, if I was going to replace the fusible link with a fuse what size would be appropriate?
Many Thanks!