Is the black ground wire or the brown?
I have a marine bilge pump DC. Just two wires – black and brown. What is a ground? I know that a motor can operate in both directions … so I want to connect properly, so it works better. I checked out. As I guessed, the engine works both ways. But only in one direction pumps. The black wire is ground. The brown wire is positive. Why coffee? Who knows. 
Ahh … cal 45, saw your post just a hair too late. Well, you have a better answer coming your way. Thx!
"If BLK BRW + connected to the reverse, pump do not throw very well>>?
DIY Bilge Pump Installation – Intro
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