Sounds like when cleaning up the wiring you may have connected the illumination loop from the car to ignition loop on the head unit. could happen if you are using an aftermarket headunit and so you had to adapt factory harness to an aftermarket radio's wiring harness...
Mine is 1991 so i bet wiring very similar if not identical. Let me know if you think this may be the problem I can post the wiring color scheme.
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Pat Herman
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