I bought a 12v air compressor to carry in the car and found the thin cord dropped so much voltage the pump practically quit by time the tire was inflated. Replaced with heavy cable and ran much better.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT