As I recall you have t tie the hot wire into a wire coming off the fuse box that is only hot when the key is on. I had a problem with this 16 years ago when I installed my Sony ....seems at night when lights etc are on and you hit the brakes it put too much strain on the electrical system and the lights would dim. I had to rewire the hot wire to one that was always hot. Never have figured that out I just have to pop the face plate pmn the stereo when car is not in use or it runs the battery down eventually. I don't think there's an accessory switch.
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