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Level Low/HWH Work Around
This work around was provided by Prevost Service.
Level Low Power For the early systems from HWH installed in the Prevost shells, the power from the circuit breaker was cut and the power went to the HWH control module and then back to the other side of the wire they cut to power the system. The HWH module was supposed to block power back to the Prevost level low rotary switch whenever the HWH was activated. The problem came from the HWH module if it failed. If it did, then no power back to the Prevost system. Later HWH systems had changes to prevent this as the normal was to let the power through the HWH module with no effect. Thus, if you lost the HWH module then the Prevost system stayed powered. But this was later in the 1990s.
For the earlier sytems when they failed you had to find CB82 and wire 24-85-16. You followed this wire as it went to the rotary switch. Along the wire you will find where it was cut as there is normaly a butt connector with a wire going off into the vehicle and then right next to it another wire returning to the place where the wire was cut. This was all in the front electrical junction box.
Once you find this connection you can turn on the ignition switch and see if you have power coming to the first splice connection on wire 24-85-16. Then check on the other splice connection and see if you have power there. If you do not, simply re-connect the two pieces of wire 24-85-16 and the Prevost system is now powered and the HWH is no longer in the level low system.
If for some reason you cannot find this splice of the wire, then gain access to the rotary switch and tind where wire 24-85-16 is connected. Run another wire from a fused or circuit breaker-ed connection to this spot and power the system this way. Or you can do as Jon has described before and simply supply the second solenoid on the manifold for the level low in the front service compartment with 24 volts and you are in ride or travel mode. This should at least get you down the road and home or to a repair shop.
The wire to the drive solenoid is 24-104-18. It was usually blue in color. Plus the later sytems had 5 solenoids and the drive solenoid was the third one down. If you can see the 1/8 inch black air lines that come from the rear of the manifold, the drive position is the only one that has a T-fitting in it as it sends a pilot or control air signal to the front and the rear Norgren valves for the drive position.
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