Disconnect the drill from Battery/Voltage supply. Spray little bit of WD-40 on the switch. Move the switch forward/backward few times to remove the dust/grime. Allow sufficient time to evaporate the WD-40, clean with a tissue paper area around the switch. Now try with Battery or Power , the Forward/Reverse swithes. Hope it works.
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Disconnect the drill from Battery/Voltage supply. Spray little bit of WD-40 on the switch. Move the switch forward/backward few times to remove the dust/grime. Allow sufficient time to evaporate the WD-40, clean with a tissue paper area around the switch.
Now try with Battery or Power , the Forward/Reverse swithes.
Hope it works.