I recently purchased a Pro-197 and decided to make up cigarette lighter power cord for occasional use in my truck. The radio came with an extra power cord which is intend to be "hard wired" into a vehicle.... I'm not doing a permanent installation so I just put a cigarette lighter plug on the cord. Works great! However, while doing this I wanted to verify the polarity of the 120 volt "wall wart" power supply so I could make sure that I wired the cigarette lighter adapter correctly. I used my digital FLUKE multi-meter to check polarity and I got a reading of 20.4 volts from the wall wart. The output spec written on the power supply says the output should be 13.8 volts. The Pro-197 manual says operating voltage should be between "12-14.4 VDC, 13.8 nominal, 16 VDC Maximum". My questions is.... Should I be worried that the factory supplied wall wart is putting out 4 volts over the maximum specified operating voltage?
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