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One of the 2 switches (key,knob) is probably shorting.
Pull driver's side door panel. Unplug connector that branches to both switches. Use multimeter to check for continuity between blk and red/grn even though switches not activated.
If yes, use pin into wires to trace to which switch is the problem. Can disable switch by eg. cutting wire so that good switch is still operational. Or leave connector unplugged if don't need power locks.
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1980 245 Canadian B21A with SU carb and M46 trans in Brampton, Ont.
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