Battery not charging? Might be time to replace your rectifier or regulator, and why not replace them both at once with a part that will work better than the originals. This Rectifier / Regulator Combo will replace both your old rectifier and regulator. Unlike many other units, this regulator rectifier is designed to work with lead acid based battieries, including Gel batteries as well as lithium batteries. You must have a fully charged battery in perfect working order before installing a new regulator rectifier.

• You must have a fully charged battery in perfect working order before installing a new regulator rectifier.
• Dimensions: 82mm Long x 30mm tall x 80mm wide, Mounting Hole spacing - 66mm (measured center to center)
• Replaces these Honda OEM part numbers: Rectifier: 31700-333-008 Regulator: 31400-300-035
• Fits Honda: CB350F - 1972-1974 CB400F Super Sport - 1975-1977 CB500K - 1971-1973 CB550F Super Sport - 1975-1977 CB550K - 1974-1978 CB750F Super Sport - 1975-1978 CB750K - 1969-1978
• Designed to work with 3 phase charging systems on pre-1979 Honda SOHC4's

You must have a fully charged battery in perfect working order before installing a new regulator rectifier.4into1