Wanted to check before tearing the K3S apart.  PTT IN on the back panel does not work. When I ohm it shows totally open with power off.  Good K3 has resistance reading and 5 V present when powered.  PTT works on the front Mic jack and also via the 15 pin ACC plug.  This is a used radio I obtained.  Acts like the line is not even wired internally but wanted to double check that there is not anything that can inhibit that jack.  Personally I think it is disconnected somewhere inside the radio.  Mike K4PI
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