I am stringing a basic 12v RGB Pixels string to a custom prop. Once I was done stringing the model, in order to minimize wiring runs, I needed to swap the connectors to the opposite ends on the string. Now the string is not working. A few pixels blink momentarily while I am plunging in the string, but that is it. Other stings are working just fine. I double-checked the connection to ensure that I maintained the original wire paring. Am missing something? Are there special considerations when reversing connectors on a string?