The green wire is on the plug connecting to the voltage regulator. I pulled the tab out and soldered the wire on and plugged it back in. As I said the other wire goes to the horn relay where the heavy red connects. That also saved running the wire across the radiator core mount to the junction box.
Just to get some clarification on this, I don't have a green wire on my voltage regulator. I do have a slightly faded blue one. Before I destroy my ammeter, i want to make sure this is correct. I attached a few pics and diagrams for help. Is this where you all have hooked up the ammeter?