An accessory configured to be coupled to a tow hook of a vehicle, the accessory comprising an electrical circuit for illumination of the accessory, the electrical circuit configured for being coupled to an electrical socket of the vehicle, and the electrical circuit comprising a plurality of circuit blocks for different lights of the accessory, at least one of the circuit blocks comprising one or more LEDs in each of a plurality of luminous branches (250A, 250B,..., 250N), a resistive load in a branch parallel to the luminous branches, the resistive load being connected to the circuit block through a resistive load switch, wherein each of the luminous branches further includes a switch so that the luminous branches can be individually connected and disconnected, a current sensor; a voltage meter to measure a voltage of the signal received from an electrical power source; and a control system for selectively closing the resistive load switch in response to a measurement of electrical current in a first branch connecting the electrical power source with the luminous branches, the accessory being characterized in that the control system is configured to close the plurality of luminous branch switches in a sequential activation when a voltage measured by the voltage meter is above a predetermined threshold, to disconnect the resistive load when the current through the luminous branches is below a predetermined current threshold and when the plurality of luminous branches are connected, and to connect the resistive load when a diagnostic current is detected in the first branch, wherein the control system is configured to detect the diagnostic current when a current with a voltage level below a predetermined threshold is detected in the first branch. a plurality of circuit blocks for different lights of the accessory, at least one of the circuit blocks comprising one or more LEDs in each of a plurality of luminous branches (250A, 250B,..., 250N), a resistive load in a branch parallel to the luminous branches, the resistive load being connected to the circuit block through a resistive load switch, wherein each of the luminous branches further includes a switch so that the luminous branches can be individually connected and disconnected, a current sensor; a voltage meter to measure a voltage of the signal received from an electrical power source; and a control system for selectively closing the resistive load switch in response to a measurement of electrical current in a first branch connecting the electrical power source with the luminous branches, the accessory being characterized in that the control system is configured to close the plurality of luminous branch switches in a sequential activation when a voltage measured by the voltage meter is above a predetermined threshold, to disconnect the resistive load when the current through the luminous branches is below a predetermined current threshold and when the plurality of luminous branches are connected, and to close the plurality of luminous branch switches in a sequential activation when a voltage measured by the voltage meter is above a predetermined threshold, to disconnect the resistive load when the current through the luminous branches is below a predetermined current threshold and when the plurality of luminous branches are connected, and