Hello to the list, Can I test my HP-13A dc supply without it being hooked up to my SB-102? I have the wiring diagram and have the 15 pin Jones plug connected but no plug on the other end. I put 13vdc to the proper wires but get no readings of any kind on the others. Does it need to be connected to the radio or is this thing toast? tnx & 73, Steve k7dna