Amazon sells a small plug in DMM so to speak, shows volts and amps,, I use them in the ac /dc blocks at home USB have a life span of 1000 to 1500 plug in according to the internet. I would take the socket out and use a multi meter and see if 12 volts even goes there,, seems Dutchman is pretty useless,,in the 5 years we have owned a TT,,, good luck,, once you find out if you have 12 volts, it is just a regulator to make 5 volts.. no 12,, no 5 volts.
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