Black or Grey 4 Wire, 2 phase full wave rectifier and 12V regulator. Suitable for most motorbikes, quads, and classic bike conversions. Works with electric start engines. Can be used to eliminate the battery and run electrics from this combined unit. Motorcycle regulator rectifiers convert fluctuating alternator current into 12 Volts DC, allowing you to run electrical components and charge the battery. Replace old units or upgrade from a two-part system. With only 4 wires, simplify your bike's electrical setup. Suitable for motorcycles with two live output wires from the alternator. Integrated full wave rectifier on each AC input makes this unit ideal for two-phase and single-phase systems. Connect the two coil wires, then connect to the battery for complete installation. Wiring the charging circuit has never been easier. The heat sink is electrically isolated from internal circuitry, making this 4 wire regulator rectifier suitable for positive earth setups. Many manufacturers use standard wiring colors based on classic motorcycles from the 1970s. Common wire colors and their functions: Yellow, White, or Pink = AC Inputs (from stator to regulator rectifier) Red = V+ (from regulator rectifier to positive battery terminal via fuse) Green = V- (from regulator rectifier to negative battery terminal) Color: Black Material: Plastic + Metal Dimensions: Overall Length: 68mm, Overall Width: 58mm, Overall Height: 23mm Cable Length: 170mm Distance Between Mounting Holes: 51-55mm Mounting Hole Diameter: 6x8mm Package Includes: 1 x 4 Wire Regulator Rectifier Note: Light and display differences may cause slight color variation between image and actual item. Measurement error allowed is +/- 1-3cm.