To pull the speedometer & tachometer

And the problem BETTER go away once the speedo is disconnected! The dimmer control gets it's wires from the speedo, right? If the speedo is disconnected, so is the entire illumination control circuit?

So what are you gonna do once everything (except the speedo) is disconnected and the problem still occurs? :ogre:

He gets to pull his speedometer, remove the bulbs and do a continuity check between the G/W & R/L wires. Then with the fuse pulled, he'll do a continuity check between the G/W & R/L wires on the dash harness.

Gotcha.

Step 0 - Buy or borrow a meter. :paranoid:

Speaking of interior lamps-

I've had my last two dome lamp bulbs fail because the filament de-soldered itself on one end. Is that normal? It's a new lamp, and when I replaced the bulb each time, all the metal parts still looked shiny-new! It must be creating a high resistance when the filament gets old and melts the end off.

Gotcha.

Step 0 - Buy or borrow a meter. :paranoid:

As I described it in another forum, an essential tool for working on cars.