Abstract: A flasher controller for vehicle warning lights that comprises a housing for a circuit board that electrically controls the device. The apparatus includes a mounting strap of conductive material which includes an internal ground connection with the circuit board and a mounting flange external of the housing that functions as the external ground connection for the circuit board. The housing is filled with a resinous material that functions as a weatherproof seal, as well as means for securing the mounting strap to the housing. The device is adapted to automatically sequentially operate and flash either amber or red warning lights on the vehicle in accordance with a plurality of selectable programs. The control functions are effected entirely by solid state electrical components which are potted together with the mounting strap.