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Your main power problem is apparent (I believe) from this picture .......
It looks like terminal 1 - which is the main power input - is burned
That would certainly account for your system not coming alive.
Both male & female connectors should be replaced
If you don't have capability to do this then splice between the two wires corresponding to that terminal position.

Also - get a socket for your relay and you won't have to worry about terminals coming off.
 

Thanks DEcosse...I'll splice the terminal 1....also will purchase a socket today...
 
Direct feed from batery to horn....horn is working fine....now checking the circuit...