[Kawa 1982]

that there are three wires connected to the headlight. The Black / Yellow wire is the ground. The Red / Yellow wire is the Low Beam side it runs to the Dimmer Switch. The Red / Black wire is the High beam side. It runs to the high beam side of the Dimmer Switch. The Blue / Yellow wire on the dimmer switch goes through the starter lockout switch to the On position of the Lighting Switch. There are three wires to the lighting switch, L, R/L, and L/Y. The L (blue) wire (12V Power) goes to a 10A fuse in the fuse block under the seat. The R/L, Red / Blue wire goes to the Illumination Lights and the Speedometer Lights. The lighting switch appears to be a three way switch. With an On position (L and L/Y are connected) an Off position (L and R/L are connected and finally a neutral position.

Based on my limited knowledge and the assumption that your headlight is good and also that you already found that the fuses under the seat are good I would start with the Lighting Switch to determine that the Blue wire has 12V. I would then check to be sure the switch is transferring power to the Blue / Yellow wire if it is then the next step is the Starter Lockout Switch. Then to the dimmer switch. I suggest that you clean all of the connectors with contact cleaner and then apply di-electric grease to the connectors while you are tracing the problem. Good luck. The wireing diagram that I am looking at is for the 1982-2002 KZ1000 Police P1 & P21. Clymer M451-3 manual.