Thank you all, vy much, for your responses. The first thing I did was examine the fuse cases. I received this radio from a friend and the power cables included seem to be OPC-025D, with a 6-pin connector on one end, used with a 6-pin to 4-pin adaptor into the radio. I saw that at one of the fuse case ends, the rubber insulation was gone from the wire, and the wire was exposed. Photo attached. Suspect, no? I'll replace this cable and see if that improves things.?
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I'll report back.?
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Thanks again!
73, Colin N2TQT