Interior Lighting

My 64 Barracuda interior lights, including roof and dash lights do not work. I assume it is either the fuse or possibly the light switch itself, although the light switch lights up the headlight and tail lights. My fuse "box" no longer has the printing that Mopar added at the factory. Anyone know which slot is the one for interior fuses and size (20amp?). Or, if anyone has a picture, that would be appreciated too..
Thanks,
Larry