DC Power Jack Wiring | All About Circuits Hi all, Looking 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.. Wiring a DC socket - why three pins? - Electrical I have a DC power supply which has a positive tip polarity. I'm good to go and wire up the socket but I am a little stuck as there are 3 pins on my socket. From the look of the socket it's fairly obvious which pin is for the center pin (which I will wire pos) so I assume the other two are for the outside (which I Soldering DC power connectors. Power socket from China Click to view on Bing7:31Overview of power connectors from China. Overall, the quality is normal. Sometimes there are "female" with angular displacement, but this does not affect the quality of the connection. "Male" is good.Author: DialViews: 25K Pictures on Dc Socket Wiring Diagram, Dc Socket Wiring Diagram. Dc Jack Wiring Diagram Wiring Diagram. Connector Basics Learn Sparkfun Com. Step By Step Soldering A Barrel Plug Onto A Battery Holder Or Dc Wiring for Power adapter? - HP Support Community - 746693 Wiring for Power adapter? 07-05-2016 01:45 AM. Hi, Me too had an old HP laptop charger which died last night. 90w with 2 wire, shilding carring the -ve voltage and Wiring an 2 DC Barrel Jack - Arduino External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2 center-positive plug into the board's power jack. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector. How to Wire an Extra 12 Volt Outlet in a Car | It Still Runs Adding an extra 12 volt outlet really comes in handy when you want to plug in that charger and the other outlet is being used. Wiring the outlet is simply a matter of connecting a positive and negative wire from the battery to the back of the outlet.