Check the wires and directions, something is crossed. Make sure your pump can do both, be in auto and be used in manual mode. I think the on switch you want to wire in will activate the auto function. There should be a float switch on the pump, be sure that works as it should. The pump may be defective or have a wire crossed.
SOURCE: I'm trying to wire a 12v bilge manual pump to a
You run your hot wire to the switch (brown) and black wire to the pump (+ve connection). Then from the pump run another wire to the negative terminal of your battery. I used to use a toggle switch on mine, but I do not use a starter motor, still all the lights, radio and echo sounder are connected to it (via a junction box). The only item I fuse is my echo sounder.
SOURCE: How to wire a 12 volt automatic bilge pump. In a boat.
Hopefully the float switch for the Bilge pump is under the engine not the pump motor. Having an electric motor under an engine is a fire or explosion hazard Find the float switch for the motor and follow the tubing back to the pump. A replacement pump should have instructions. Only the pump intake should be in an explosive environment.
do you have it wired like this?
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