On the MTH 24 port terminal block, the lower levels are all positive (red), and all the upper raised levels are all negative (black) on BOTH SIDES. All of the upper & lower ports below red are NOT all positive, likewise all uppers & lowers below the black post are NOT all negative. If you turn it over, you can see on the bottom the printed circuit board travels from the main red terminal to all 24 lower ports on both sides. Black terminal goes to all 24 upper ports on both sides.
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