Following wiring diagram and cable routing apply for Honda CB350F and CB400F series. In this manual you will find brief information, description and illustration of electrical system, wiring diagram and cable harness of the motorcycles e.g. charging systems, starting system, clutch switch, starting switch, silicon diode, main switch, dimmer and turn signal control switch, horn and engine stop switch.
Check the diode for continuity with a radio tester in high-reading rang. If current flows only one direction (from cathode to anode), the diode is normal. Current flow in either direction or no current is a sign of malfunction of the diode.