DC Power Jack Wiring | All About Circuits Feb 06, 2012Looking for some quick assistance (easy one) on how to properly wire a 3-pin DC power jack. I don't need/want the switching pin. The positive pin I am assuming is the center. The switching pin I am assuming is the pin that does not have continuity when I test between it and the jack when inserted? Assuming that, gnd goes to the non-switching pin? Connectors - DC Power, Coax | All Electronics Corp. CUI Inc # PJ-018. Right angle 1 coax power jack with a normally closed shunt that opens when plug is inserted. Fits our..