which wire??
 

which wire powers up the fuse block??

no one???

assuming its the 68 try asking in the first gen section. its best to let the guys know what your working on, not to many guys check this section.

On the horn relay, there is a 10 ga. red wire that comes from the passenger side junction block near the battery. That wire also splices off to the alternator and voltage regulator, before it gets to the horn relay. Interconnected to that same lug on the relay is a black wire with a fusible link. After the link, it becomes a red wire and goes to the bulkhead connector, then the fuse block.