How do you turn off a forklift backup alarm?

Typically there will be a square little black speaker mounted facing behind the lift in the upper back corner of the roll cage frame.

It will have a couple of wires running from it possibly into the hollowness of the roll cage frame.

There will probably be a rubber cork or a vent looking piece within a foot of the speaker on the side of that fatter hollow roll cage frame.

Either out next to the speaker or under the rubber cork there should be a place the speaker wire has a place to disconnect it from the wire that runs the rest of the way to its power source. Just disconnect it there & put the rubber cork back if it has one. Now you can roll to the sweet sound of silence. ...

Till you run over someone then I guess their screams will be the new alarm.