The terminal block is a convenient way to terminate wires. On some trucks in addition to the power feed, the Amp meter wiring is hooked to the terminal block. On trucks with dual batteries a third wire is hooked to the terminal block.
It is really not required as you can connect directly. The problem pops up if you try to disconnect your wiring harness. With the terminal block, it is just a matter of unscrewing the nut.
Jim
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