When we added lights we used the small 3.5 vdc led bulbs with a watch battery (3.5 vdc) as a power source and put a switch on the front of the main battery velcro holder. We used 22 ga. wire. To strip this wire you really only need minimal fingernails to pinch and pull the cover off. The connections were soldered together then taped. To connect the battery we stripped about 1 inch of wire curled it and laid it on a piece of black electrical tape with a piece of tin foil on top. This whole piece is only the size of the battery face. We did both pos. and negative contacts in this manner. Then wrapped the contacts onto the batt. with a piece of black taped stretched so as to squeeze the whole thing together.. Attached it to the side of the 4-1 with another short pice of electical tape.