I have a 81 GMC stepside that the front parking lights, rear parking/tailights, interior dome lights and gauge lights will not work. The headlights, front and rear signal lights, brake, back-up lights and flashers work perfectly. I've checked and replaced all bulbs and the fuses all look good. I've looked and can't find any damaged or broken wires and have cleaned all the grounds that I can find. The headlight switch has also been replaced. I have power going into the headlight switch, but nothing is coming out when the switch is pulled halfway out for the parking lights.
Any suggestions to help fix some or all of these problems would be most appreciated.
Chris