Fuse Box???

Hello All,

I have a 65 fastback 4speed car and I am adding a painless 7 circuit aux fuse panel to run my msd box and electric fan etc. I am tapping into the fuse box for a ignition hot source and I came across a black three plug connection that is hooked to the fuse bock. Is this a ignition hot source. Another ?? I have is can you use the solenoid in the engine bay as a ignition hot source??? It only gets power on one side when the key is forward??? The opposite side from the battery??? Thanks in advance....
 
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