300 E - Instrument Accessory Lighting OUT

Please someone HELP!!

Iwas doing a bulb change on the passenger side A/C vent as well as replacing a few others that were ready. When I was done I wanted to see the new bulbs in action, when I switched the park lights on there was no illumination anywhere, I went through the process of elimination and found the problem was on one of the new bulbs- the two contact wires coming out of the glass base were laying over each other therefore shorting the lights out. The thing I dont understand is why the fuse didnt blow under the hood ? (The one that says instrument illumination).
I would appreciate any one who knows these electrical systems to let me know where the problem could be, or even a wiring diagram that I could use to trace the problem.

Thank you for any info you can offer,

K.A.Smith