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With power ON in the coach, air dumped, the HWH air leveling system set for automatic, the compressor should be active. It will come on ONLY when the coach senses an out-of-level condition. There are two 12 vdc leads to the compressor, one switched 12-vdc (black wire 9700) which will be hot when the ignition is on, and one 12-vdc (red wire 6104) that is hot anytime the system is turned on, and may have a 15-amp in-line fuse near the compressor.
The control box sends the switched 12-vdc to the pressure switch on the compressor. If pressure is low, a 12 volt relay located on the compressor unit will energize and the compressor will run.
If you don't have the HWH manual for your system, go to their web site and download it. They also will have an installation manual and a troubleshooting procedure you can download.
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Rex
2001 Monaco Diplomat 40' PDQ - 08 Honda CR-V
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