Tsumani 1200 GPH wiring question

[texastige22v]

OK, I have my Tsunami 1200 GPH pumps. I've studied the threads and they have been a big help. But I have a question about the wiring. The pumps have a black wire and a brown wire. They did not come with any wiring directions. Which wire is the positive wire and which wire is the negative wire?

[kko]

brown is positive and black is negative.

[Ruune]

Solid black is always negative.