1974 Plymouth Duster no power through bulkhead.

S4 looks like it plugs into the bulk head from the wiper motor harness. is that correct? and the missing J3, that connector is connected how it was on the old harness over at the firewall below the coil.
S4 is the neutral safety so it looks like that is taken care of by the splice to the B&M.
You can always make it nicer but seems functional for now.