I dunno couple issues

[Yupiamlo]

Hey, so I have been trying to make the driveability of my truck better its 85 c10, 2wd, 350/350. Currently it idles pretty goo in park, but when you put it in gear it dies, so you have to two pedal it everywhere. So we did cap, rotor, spark plugs, and egr gasket, its getting better but not there yet.

Ne way after doing the spark plugs, I dont think my alternator is charging, because the gauge is reading 9-10, and my running/headlights dont work. I swapped the switch out, but that wasnt it, so I stole power from another constant hot and got the lights working.

My question is why would my alternator suddenly stop? and on the light switch, their is two constant hot tabs, ones red and ones orange. Their is two orange wires, what do each do? and where do they run that they would suddenly stop working?

Thanks
-Adam