That is your float switch and should be wired straight to the battery.
Don
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1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
I'd make sure your float switch is working before you buy the new pump. You can get them with the float built right in for basically the same money as a pump that requires a separate pump. I can shoot you the type and a pic of the one I got in just a bit. I don't think it was very expensive.