Fast! Need to use with a winch solenoid to handle the amps
It's very fast (I'm using it to fill two 850lb bags, splitting the 1.5" line into two 1" lines), but this is more of a wiring instruction guide than a review.
Because of the high amps temporarily used when the pump is switching directions, you can't run the power directly from the battery to the switch to the pump. Instead, you need to:
1.) Run power to the switch.
2.) Connect the switch to a relay or winch solenoid.
3.) Run power separately to the relay/solenoid (12 gauge). This power line is what the 50 amp fuse is for.
4.) Run power from the relay/solenoid to the pump (12 gauge).
So the switch will just tell the relay/solenoid to switch polarity, and the relay/solenoid will handle the extra amps as it sends the +/- current from the battery to the pump.
It took me a great deal of time to get this figured out, involving numerous solenoid/relay purchases on Amazon and finally resorting to getting help from an electrician (took him about half an hour to figure it out, so I didn't feel as dumb). I ended up using a "winch solenoid", because the design is simpler than a relay and it's more sturdy. The winch solenoid I ended up using is https://www.amazon.com/gp/product/B08P1W3YM4 but there are a whole bunch you can choose from and they behave the same (I actually tested 4 of them when I was having a problem, so I know they work the same)
You do NOT want to use one of the "pre-wired switch connectors" in this case. Those are great for a lower-amp pump that…