Can anyone tell me what this is??

[Ricko1966]

the only time this might be safe would be an unused but internally present maxifuse position of sufficient size in fuse boxes (startin with gmt400 i think)
Most unused maxifuse positions wont have one or both of the legs in my experience
But the maxi fuse portion or separate maxi fuse blocks are usually pretty stout and meant to move a lot of power, of course you wouldnt want to exceed the overall intended positions original size most likely

Not on a 1974 c10 would it be acceptable to wire a whole 2nd fuse box to one fuse in the original fuse box.

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It was the next post after this I was called a booger eater,fire starter,I can't remember it all.