Cusser
+1y
Running lights means parking lights, correct?
On the B2200 trucks, the tail lights, instrument panel lights, and the parking lights are ALL on the same circuit from the headlight switch. So if any of the above are working (and you say the tail lights work), then that switch is working, so check bulbs, sockets, wire connectors in the engine compartment, up in front of battery and also on driver side.
Was any front bumper/grille work done? Those parking light connectors are disconnected to R&R those.