Hi, Chuck:
I had the same problem with my K3 using an Astron 35M; tried my SEC1223 switching supply and shut down continued. Very frustrating but I eventually tracked it down to the Anderson Power Pole connectors! I am not a fan of those ubiquitous things!
I'll bet that's where you'll find your problem!
73,
Cary, K4TM
K3-100 #3994 and, originally, #0178
Sent from my iPhone in beautiful Pawley's Island SC
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