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Something in the main electronics (the Gunn generator for the sensing horn?) on some detectors is 9V, and instead of bulking-up the detector, manufacturers put the converter in the lighter plug. Early Unidens were this way, and today most GPS units (TomTom) are low-voltage as well. Running 12V to a 9V or 6V accessory will either let all its magic smoke leak out, or (if it's a quality product) will simply not operate. The easiest solution is to get an aftermarket socket and hook it up under the dash, run a zip tie around the plug and the socket to keep them together, and run the power source to where the accessory will be mounted.
If you accessory is 12V, you can do some tidy stuff using the dome light power source.
Keep in mind also that many accessories run their plug with the TIP -the inside of the power plug- negative, and that nice, shiny RING positive -the outside part of the plug that's going to be touching everything it lays against- which will short-out as soon as it hits metal on the car's interior. Most power supplies that plug into the cigarette lighter have a fuse inside the nose of the plug. Make sure you fuse any accessory power source.
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