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Step 7Start the wiring.
Wire the positive lead from the battery holder to one of the contacts on the switch. Now, wire the negative lead from the battery pack to the negative lead of one of the LEDs. Then, wire all of the NEGATIVE leads together. This is the difference between parallel and series. In series, the positive leg of one LED is wired to the negative lead of the next. In parallel, all the negative leads are connected to each other, and all the positive leads are connected to each other.
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