[Thomasluke7899]

So your fuse holder is melting....how would a bad ground cause that?
If the fuse holder is melting and the fuse is not blowing and the power wire insulation is not deformed at all around the fuse holder the most likely thing here is heat from the engine or a loose fuse causing an intermediate connection causing heat at those connection points which then tries to dissipate into the fuse holder. Since the fuse holder is not a heat sink it melts.

 

[Thomasluke7899]

If you are not crimping the ferrule on a 4 awg wire and are using the set screw to crimp the connection that is your problem.
A set screw in a ****ty ni name amazon fuse block are not strong enough and only make a connection on part of the wire.
Either crimp the ferrule with a ferrule crimp tool or just use bare wire.

 

[Thomasluke7899]

I did just use the set screws to crimp the ferrules but they are on there solid and not coming off so I'm not exactly sure how that could be a problem. I put the ferrules on once and they have stayed after switching multiple times because after the first time cranking the set screws down I couldn't get them off without cutting them. Its basically crimped, just not with a actual tool.

Ok.