1997 Cadillac Catera

Electrical problem
1997 Cadillac Catera 6 cyl Two Wheel Drive Automatic 124000 miles

the radio and inside lights wont work if the key is on or if the car is running, but as soon as I turn the car off everything works. Please help me fix this. Some one said it was the anti theft. Thanks
March 7, 2010.

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