Custom Dynamics' TruFLEX® Dual Circuit Converter. TruFLEX® Dual Converters will convert your TruFLEX® from Single Wire to Dual Wire. Used for tail light and turn signal applications. Example: will convert single hot wire to running (30% Intensity) and Brake (100% intensity). Select the converter based on the number of TruFLEX® LEDs you are converting from single wire to two wire.