all of my lights went out in my 1996 mercury grand marquis, my interior, head lights, blinkers and rear defrost all stopped working at the same time, l checked all of my fuses even the ones under the hood, none of them are blown, does anyone have any idea of whats gone wrong??

do a recheck of what you consider fuses. l say this, because, there are what appears to be a fuse, it has a metal case around it, with curled connectors. Those, are circuit breakers, that are self resetting. Some times they go bad.

Defective headlight switch.

check the fusible links they are located near the battery you will need a test light or an ohm meter 2 check them