Posted by Bob on October 16, 2018 at 08:48:01 from (64.255.159.199):
In Reply to: Positive ground posted by Fordy20 on October 15, 2018 at 16:48:57:
Quoting Removed, click Modern View to see
"DC motors are polarity sensitive."
NOT true, generally speaking but TRUE with permag DC motors, which, likely, the spray pump motor IS.
But that's OK, as (typically) those units are not internally grounded to their chassis, but instead have a separate power (red) and ground (black) wire coming out of them to be connected to power.
Simply reversing the red and black wires will correct the roation when used with a (+) ground system.
On, depending upon what type/how big this setup is, it MAY be a simple diaphragm pump that will operate equally well running in either direction. (Check with manufacturer of pump.)
So a photo/more information is needed to be certain of what issues, if any, there may be here!
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