I used a regular bulb as well with the same results. Also cleaned the tabs the bulb makes contact with.
I will take a closer look at the switch and chase some wires with the diagram tomorrow or the next day, I have looked at it and all the colors matched up to the diagram but both wires for the dome are orange so I will need to chase that down.
Only reason I thought it was coming from the fuse block is because I don't have blinkers at the moment or brake lights (although my tail lights do work), but some of the under bed wiring was obviously altered over the years as well as the blinker mechanism so those may all be separate issues.
