Power steering electronic fault

My power steering is working but stiff at slow speed and parking . I have changed rack anyone know how test the electrical side it’s a 1998 xjr 4.0 V8.

on the rack is an electrical plug. DIsconnect it and measure the resistance of the rack. There should be some resistance.

Put a 5W bulb on the car loom. Turn the ignition and engine on. The bulb should light up.
If not there is a custom ZF relay somewhere. (left front footwell I think) that may need changing or checking

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Interesting thanks for info I have a spare relay somewhere will try that first