Are you trying to connect the 8 18" strips in series? I would run them in parallel, this will cut the number of soldered joints in half since you wont be trying to connect the end of one strip to another. Also, do the strips and the controller have the same polarity? Does the LED strip need a constant B+ and switched ground to tripper the light or a common ground and a switched B+ for each color to trigger the LED? They can come either way and the controller needs to work the same.
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