Well, first problem is the indicator light, and I am hoping this is really the "ign" light and NOT a high-beam indicator light mis-wired.
So, if it is the "ign" lamp, for sure, one side is ignition switched side of the ignition switch, period. The other side, one wire only, goes to the "ind" port on the alternator. You unplug the wire from the "ind" port on the alternator and the lamp does not go out, the wires go to the wrong place, period. A ground on that wire won't do that (in fact, it will be opposite....key on, light on, key off, light off).
Is the wiring loom open in the engine bay? If not, open it. Follow that green wire back, see where it goes. See if there is a bullet connector in the loom, near the firewall, mis-plugged, Look for a brown/yellow wire in the loom. I know it;s hard, but look under the dash, follow the two wires out of the lamp, one should be white, ignition feed, other brown/yellow, see where it goes, see if it is mis-plugged.