The diagram show it as Ma Mopar did it. You are correct I just tied into the blue on the ignition 1 side of the ballast resistor. FYI the new alternators can crank out in excess of 60AMP. The wiring carrying the current through the ammeter is not rated to carry that many amps and you run the risks associated. The bulkhead being the weakest point in the system. Quick fix is run a 10ga. wire from alt. Battery terminal to the Battery terminal on the starter relay. Takes the load off the original wires, but the ammeter will not read properly as all current is not flowing through it anymore. I did this on my 64 and I am next going to run new 10ga. wire to my ammeter through the firewall with rubber grommets and eliminate the original wires. Ammeter may still be at risk but I am confident it will be OK. A new ammeter rated for higher amps would be the safest bet.