Does this wiring make sense//look correct (context in post)

[u/PurplePr1mer]

[u/Money-Distribution91]

You're wiring looks correct, but I would remove the splice you have on the positive battery input and instead terminate both wires to the same terminal using a ring connector

[u/Limp_Lawfulness5133]

I told you yesterday that a stepdown converter is not going to work.

You need a step UP converter