Thanks mikey. that schematic and the info are awesome. i turned everything on, and the #3 terminal reads at 12.4v. the #4 terminal only reads at 5.4v.
so i'm guessing that either the regulator has gone bad, or i'm going to have to chase wires and find where the light is grounding?
speaking in terms of being lazy, if it isn't the regulator going bad, will the alternator charge if i leave the jumper from the battery to the #4 terminal, even if the light is grounded?