I'm trying to get all the interior lights working in my truck. I have everything up and running except for the backlight for the headlight switch. It is a very odd really long bulb. I can't find a part number on it to cross reference. Does anyone know what this bulb is? It looks the same as the bulbs for the HVAC controls just a lot longer.

 

what year is the truck? they changed the headlight switch at last once during the production run of these trucks, and the newer one uses LEDS so non-servicable, you would have to replace the switch, im not sure about the older (pluger style) switch

 

It's a 2003 and does not have a LED. I can remove the bulb itself from the back,