each sides pair of tabs are actually a single connection with provision for 2 wires - factory diagram shows 2 wires on passenger side [to ignition sw and lite sw] and 1 wire on drvr side to battery connection on the starter .... the horn relay originally got power from the regulator, must have been changed because of the alternator?
by the diagram, I believe the regulator would have fed the generator power to the terminal on the light switch and from there thru the ammeter to the battery - with the alternator direct to the battery[starter post] the current to the gauge is going backwards - pretty sure reversing wires on the gauge will make it show charge, but that's not really the correct way to wire it
Bill
