cruzn_n_vw

...when they want. any ideas? just purchased my wrangler and when i got in it for the first trip across town i noticed that my check engine light and brake light were on and there was no power to the radio, air, wipers, and turn signals. when i took it into auto zone they told me that i needed my O2 sensor replaced. well i went to pep boys and they forwarded me onto the dealership so could get it fixed there. well $500 bucks later and after the dealership had my jeep for 2 1/2 days (replaced O2 sensor and cluster box?) GUESS WHAT...same problem....so im guessing i just spent 250 bucks for nothing?

does anyone have any ideas? i do not want to get pulled over every other time i drive because i cannot use turn signals..and i also dont want to be shelling out another $500 to find out whats wrong....please help