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You checked the fuse that is contained inside the cigarette lighter adapter, correct?
If that fuse is blown, get a new one at your local electronics store.
You should also verify that the power from the cigarette lighter adapter is on. You can do that by testing it with the actual lighter, or you can use a voltmeter or test light to determine if power is reaching the lighter outlet.
A lot of the time this is caused by a somewhat flaky power connection to the radar detector, or may be caused by excessive electrical system noise created by your car's alternator. The cigarette lighter socket itself my be the problem due to oxidation within the socket. Do you get false laser alerts when you rev your car's engine to certain RPM's? Do you get either laser or radar falses if you jiggle the radar detector's power cord or slightly move it plug in the cigarette lighter socket? If yes, to either, then installing a hardwire power kit may solve the problem. Jump over to radardetector.net and describe the problems you are having with your radar detector. Most likely they will help you to track down the source of the problem.
This is caused by electrical noise in your car's electrical system. Specifically, the problem is excessive alternator whine. This can be exacerbated by somewhat corroded contacts in your car's cigarette lighter socket or by a somewhat corroded vehicle wiring connection to the back side of the cigarette lighter socket.
One potential solution is to try a snap-on RF filter which is available at your local Radio Shack. You would snap this filter around the positive 12V wire leading to your car's cigarette lighter socket. Preferably, if there is enough free slack in the 12V wire leading to the cigarette lighter socket, you would wrap this wire through the RF filter twice before snapping the RF filter closed around the wire.
First if you still have the old "lighter plug" unscrew the ribbed end cap of the cigarette lighter adapter and check to see what size the fuse is. If you don’t have it anymore it originally took a 1amp fuse. Do Not use anything bigger then a 1amp fuse....You can pick them up at your local electronics store like RadioShack. In fact they will have a cigarette lighter adapter for you just remember to take in your Cobra ESD 6000 Radar Detector...I hope this helps...Let me know... cbinny1