Have a 2009 CAT 257B2, Hooke up a grapple bucket to day and it wouldn't work. Played with the rocker switch for a few

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Are there any warning indicators on or lights flashing?

When this stops working are you hearing a load on the engine like it is trying to function which would tell us that the control side of the circuit is likely functioning but the problem is likely on the mechanical side within the control valve or the relief valves for that circuit? If you are not hearing the hydraulics load the engine like they are trying to function, the problem is likely in the control switch or wiring harness of the joystick assembly going to the control valve and that circuit. Thoroughly inspect the wiring and connector pins for any corrosion or damage as well as any open circuits. If this checks okay, check your control valve for any type of debris as well as for any damage or problems that would cause the valve to stick or malfunction. Be sure to test all of your fuses for power on both sides with the ignition switch and the opposition replacing any with power only on one side. Swap your relays one at a time with a known good one for testing purposes. I would also check to see if there are any fault codes or event codes logged within the ECM history that could also be related to this issue. If found, I would troubleshoot each of those faults separately. It is a pleasure to help anyway I can.