You don't dump air on that system you just hit the horizon level button and it does the work for you.
Make sure you have the grounding update done. If not that system can be really flakey.
June 29, 2005
Firestone has found a ground noise issue on a number of Monaco coaches. The ground noise can
potentially cause a coach to not level properly when using the Horizon Level feature. Because of the
variation in ground noise between vehicles, the leveling error can vary from slightly noticeable with use
a level to obviously detectable. As well, some vehicles may have no issue with achieving a level
stance. Because it is difficult to determine the ground noise of each vehicle, we recommend making
revisions to the system grounding as a precaution for all vehicles.
After making the grounding revisions, a vehicle that previously did not level properly should easily
achieve level. If it does not, there may be calibration errors. In this case, the calibration software
should be used to recalibrate the vehicle on a level surface. An improperly calibrated vehicle will not
level regardless of the ground noise issue.
The following directions describe the process to modify the wiring on existing vehicles.
1. Disconnect the air manifold connector and locate the ground wire on the "System Side." This will be
located at Pin F.
2. Pull about 12" of the ground wire out from the harness and cut it.
3. Tape off the remaining wire in the harness and the put the protective covering back on it.
4. Crimp a ring terminal on the 12" ground wire that was pulled out.
5. Unbolt the outermost accelerometer bolt and scrape the paint off of the bracket below the bolt
6. Connect the ring terminal onto the bolt that was taken out of the accelerometer and tighten the
7. Secure the harness with a wire tie to prevent excess vibration at the connectors.
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