I have a retro radio in my roadster. Recently it decided to not turn on anymore. I have traced all the power wires and they are Ok but wondered how do you test that the earth wire is working. The wires from the radio all come out into a connector that connects with power supply/speakers/earth etc. If it isn't the earth then I think the push*****on switch is cactus and that probably means replacement!!!
Ohm meter.....check from radio earth wire on one lead....to chassis or battery earth on other lead, should have continuity
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