thanks i'll check the grounds in trunk first. i noticed a grey wire that has been disconnected in the gear shifter cig lighter area due to an aftermarket alarm which was installed by the previous owner. also there is a black wire disconnected in the same area. the grey wire is now routed into the aftermarket alarms harness. i noticed this when i removed the aftermarket stereo that had been sloppily installed by the previous owner. i returned the decks harness to stock. what are these black and grey wires for? could they be causing left tail fuse to blow once car put in reverse?