upgraded duster alt, no gas gauge, coolant temp gauge, wipers, or dome light

Actually the seatbelt device is not in the ground circuit to my knowledge. The one's I've dealt with (only about 3) had a reset relay under the hood, with a two yellow/ yellow tracer wires on the connector. You jumper the two yellow wires, and off you go.

Correct. Its realy just a switch that interupts the start signal ftom ign' switch to start relay which was always a yellow wire.