messed with the cigarette lighter and blew the fuse. So no radio. Replaced fuse. lighter works and radio as well. But not speakers. Worked fine yday? Any advice.

Sorry. front speakers work fine. Back speakers do nothing.

I take it you have set the "Fade" on the radio. If not, that's the first thing to try. Otherwise, time to start tracing wires to rear, I hate to advise you to take the radio out of dash. It not coded for anti-theft but still a pain. But you need to find the wires for the rear speakers, and run a new, test wire from output to rear speakers, just a temporary right over the seats.. and see if they work then. This is the best schematic I could find, and it was small, but I scaled it up as much as possible and have some focus...but is it a 4 speaker or 6? Have speakers on the dash..or front doors and rear deck only?