You my friend have blown the diodes in the radio, the clock, and the interior light,(which i believe has a slow dim circuit board wired to it). These diodes only allow current to pass in one direction through a circuit and will be irreparabley damaged at light speed by reversing the polarity. The diodes themselves are very cheap to buy, but can be expensive to get fitted. To repair it yourself take whichever of the items apart and check the circuit boards, the offending article should be obvious.(burnt) Maplins eloctronics should carry a range to cure what ails you.Best of luck, Paddy.
paddycanman
April 2008