Radio lights off on 1998 ford explorer

1 -Check your head light switch and turn signal switch by taping them lightly - Common problem with fords to short signal light switch/head lights and they also have radio lights/clock lights control(lights dim for Radio/clock when you turn the lights on)

If you have checked all the fuses and switchs, possible that the light bulbs have burned out. Check with a local radio repair shop and they can remove the radio and install new bulbs.