Help, No power when turn key
............if the ............ would it keep running............... and have all the guages work and power to the fuse box?
'T's the reason I posted the link and diagram. You may have an intermittent bad connection, that is, a connection that "comes and goes." Placing a LOAD on the circuit may make the bad connection break. On the other hand, if it "decides" to run, the charging system may produce enough (sometimes!!!!) to "arc" over the bad connection.
You need to learn some troubleshooting, how to check, don't guess.
Start by the basics. Pull and wiggle wires, look for loose connections. Remove and clean the battery cable clamps. Wiggle the wire at the starter and starter relay, wiggle the bulkhead connector, and pull it loose and inspect it.
READ the MAD article. Even if you don't bypass the ammeter, that article shows you the pitfalls of the main power distribution in these cars.