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International Automotive Technicians Network
Re: Old school mechanic 'tools' people don't think about
Posted to Open Discussion Forum on 3/2/2023

It will flash no matter how connected because the signal (analog) is AC so it (the current) will flip flop back and forth and normally the LED will not be blown because current is very low, along with the voltage when spinning the tire by hand or cranking an e... Login to read more.