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It is important to connect the wires and test everything before proceeding with further assembly. The battery pack is on the left, and its positive wire (red) goes through the switch into the power leads of the driver circuit. Its black wire is connected to the power leads of the driver circuit. This picture is a little confusing, because I used a two-way switch that goes between the battery pack and the external power supply. You can see that the red wire from the external power plug on the right is connected to the other terminal of the switch, and its black wire is connected to the driver circuit. In this test, I was checking the batteries and left the external power unplugged. In case you don't recognize it, the driver circuit is the grey lump in the middle. The wires sticking out of the top go to the power source, and the wires sticking out of the bottom go to the LEDs. If you look carefully, you can see they are attached to the wires from the base of the tree. I took this picture after I got the test to pass, and you can see the LEDs are lit up. Short circuits and bad connections are easy mistakes to make. I actually made some short circuits between the enamled wire and the tree by pulling on it too hard and nicking the enamline. Until I replaced that wire, the lights wouldn't come on. I figured out which of the enamled wires was nicked by connecting them one by one, and see which one didn't produce light. If none of them lit up the LEDs, I'd attach an LED directly to the driver circuit to make sure that was working.