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'84 K100RS here, same thing happened to mine when I chnged out the old relays with newer, ya know, to "upgrade" the system. Turned off motor, headlight stayed on??? What? Tried again and again before I took off tank, put old relays back; and it's works as before with the original on/off handlebar switch. Good luck. The early K bricks had a few quirks, which I like. Just put classic plates on mine.