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The key needs to be turned on or back in accessory and the parking brake set for the jacks to operate. Do you have any lights on the joy stick base plate?
Make certain you have good battery voltage and tight connections. These units are susceptible to getting dirt down into the joy stick area. You may want to use compressed air to blow out any debris. Have you checked under the steps for the pump assembly? You can always trace the hydraulic lines under the coach to the pump location. You can also download a service manual for the system you have from HWH or other websites; just run a search for your model.