So tonight I was trying to get the interior lights to work. The front dome light works in 'on', but not when you switch it to the middle position so it can turn on when a door opens. The switch works correctly. I get 8v at the front pax door switch, 12v at the driver door switch, and nothing at the two rear pax doors. The door switches all work correctly. When I was removing and installing the driver's door switch, the driver's power seat relay was clicking. All the fuses are good. Tomorrow I plan on checking the connectors. All the grounds have been checked, removed, cleaned and reinstalled with dielectric grease on them. There was no corrosion on them to begin with, but I did them anyway. Any suggestions as to where to look next?

 

This is a common problem with no answer that I know of because people have either given up or set their truck on fire.
So once you figure it out PLEASE post the answer.

 

What about the ground behind the lamp/switch assy? There should be a ground running from the switch to the metal plate behind the assy. I had a similar problem with the lights not coming on when the door opens and the lack of ground wire there was my problem. Just a thought.

 

Already checked that one. It was good as well. I plan on checking all of the relays for corrosion. Can't hurt.