Only models of KTM motorcycles with carburetor require a rectifier since these models have AC to the headlight. Fuel-injected 4-stroke or 2-stroke models have DC to the headlight and do not require a rectifier. You also do not need a rectifier if you connect the headlight to the rechargeable battery with a separate wiring (not included in the kit).
Our rectifier is more efficient than a conventional diode bridge. The circuitry saves power due to low voltage drop on key elements and provides dual-channel low/high beam headlight operation. Our rectifier reduces the risk of draining the battery due to frequent starter use in a hard enduro.