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I contacted Gradall (JLG now) and they stated they no longer support this machine and don't have a wiring diagram that was ever done specific for this machine. They sent me the same exact links as the other expert provided to you which has a wiring diagram on page 92 of the .pdf. Hydraulic diagram on page 93. That is the best they said they have. There is nothing else available for this machine.
CLICK HERE in case you need the service manual again as to what is referenced. There just isn't anything else available for it for there was nothing made for it.
I wish I had better news for you. I know you asked for a second opinion, but I am having the same obstacles for a wiring diagram. It just does't exist beyond the service manual.
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