2000 wrangler ignition problems

I have a 2000 wrangler and when I try to start it nothing works but the heater motor.
The engine will not turn over,the trouble lights do not work and niether do the turn signels raido or lighter.
I have checked all the fuses and changed the ignition switch and battery.
Can any body help?
Kenny

Trace the thick negative wire going to the engine block. Take the nut loose and clean it good with a wire brush. See if that fixes it. If not trace your negative wire from the battery to the starter, have seen them come loose before. If not loose, clean that one too. Sounds like a bad connection somewhere.