What is that switch under the seat? It is a pressure switch with two wires that go to it.
My name is Micheal, I have an 1989 743.
I bought it not running, rebuilt motor, Kubota 4 cylinder diesel. That is a trans charge pressure switch. It has a normally open and a normally closed sides. The normally open hooks to hour meter and the normally closed hooks to trans. Oil temperature switch.
With this hook to oil temperature switch it helps keep hydraulic temperatures down.
Here is the link from Amazon to replace the old one.
Solarhome 6671062 Hydraulic Charge Pressure Switch for Bobcat 443 540 542 543 641 642 643 645 741 742 743 753 843 1213 1600 2000 7753
https://a.co/d/6NpXZXg