Vortech Trex Pump

Installing One Of These On My 95 Today. No Markings For Positive Or Negative On Pump. Does It Make A Diiference. It Seems To Me On A Dc Motor If You Wired It Backwards It Would Try To Pump From The Front. Any Thanks Would Be Appreciated

Mine's marked, its just molded into the white plastic.

That said, if you look at the pump with the discharge end facing you and and the discharge outlet at the top, negative is on your left.