The end of the plug which gets inserted into the cigarette lighter/power port should unscrew. Inside is a fuse. You need to replace it with the identical size and rating of fuse. Check the unit with an ohm meter for any shorts between both conductors. If the unit is shorted toss it and get a new one. If it isn't shorted it should work with a new fuse. Let me know if you need any more help.
hardrocko
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