Hi.. you do not need to solder both + pos wires together same with Neg - . this pack is made for people needing duo outlets .or can be used as upper poster said . but wanta see him solder these to 5mm plugs...(make it fit hammer not included).. I use one of these in my quad edf..I run dual deans plugs ..you can just use a single set of output wires..and tape the others to pack ... use the KISS method here.