Drivers side headlamp not working and ground issue

wonder if anyone can help with K12 electrical issue. Drivers headlamp not working on low or high beam, bulb ok. Fuses ok, but no ground at bulb connector ground terminal, all showing V Batt ! Cut black ground at bulb connector and connected to body ground. Headlamp works on low and high beams, but issue is if the light lever is pulled to flask, the high beam stays on !! If I switch side lights on and off again then this switches off the high beam. Does anyone know how to fix this please, not sure if ground fault or if something else is causing this.
Thank you.
 
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