If the Parking brake is set, the first check I would do is make sure the levelers work first. That eliminates the hydraulic pump - the hydro pump runs BOTH slides & leveler jacks.
By the pump is a headlight relay. This controls the "interlock" between the P Brake and the slide motor. These fail as OPEN, so your slides won't work, but your leveling jacks do.
If you have voltage on 1 terminal but not any of the others, it's bad. Get a new 40A or greater headlight relay and replace. Just write the terminal numbers for each wire down or transfer one at a time. I've got a 50A on mine and it hasn't failed in 5 years.
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