Where is the seat safety switch located on my machine?

[USVeteran]

I'm trying to locate the seat safety switch on my machine. I think one of the safety switches is causing problems because the engine runs rough unless I disconnect the bar safety switch. But when I do that, the hydraulics stop working.

As far as I know, the machine has a seat switch and a bar switch. Does anyone know where the seat switch is located or if this sounds like a bad safety switch?