The risk is probably very minimal. but why invite problems?
Everything in the car should be grounded, but there is no real path for excess voltage.
I had to use an air gun for some issues I had with the Volvo transmission control unit and ABS module when I was singling the rear axles. I used my metal air gun, but I attached an alligator clip wire to the nozzle and connected the other end of the wire to the chassis.
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2017 GMC Sierra 1500 SLE
2020 Fusion Titanium
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