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Aux. Air Pump

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Dennis Crawford:
To All:

I have a 2005 Monterey with air leveling.  I never hear the aux air pump come on and I know I am low on air (another issue with an air leak somewhere).  But this pump should come on and pump up to the proper pressure and I never hear it.  Is there an easy way to see if the pump even works?  

Thanks,

Dennis

Gerald Farris:
The best way to check the leveling system electrical air compressor is to run a fused 12V positive wire to the hot terminal and a good ground to the ground terminal. This will cause the compressor to run if it is good.

From your question, it sounds like you think that the electrical compressor should keep the air tanks aired up at any time that the leveling system is turned on. That is not the way that most systems work. In most systems the compressor is turned on only when the system needs to increase the air pressure in one or more of the air bags and the air pressure in the tanks is below the predetermined set point.

Gerald  

Joel Ashley:
Our '06 Monterey has always had a microleak somewhere in the left rear bag system, and the compressor commonly takes over when we are camped and tank pressure is diminished, as Gerald points out.  

Another option, if you don't have a handy-dandy portable power/jump start/compressor unit to tap 12 v. from for example, or some other convenient 12v. source, is to jump across the pump's hot and ground studs with an ohm meter.  Disconnecting the hot lead would be a good idea first so you can't harm the meter if the leveler panel sends juice to the pump during your test.  There should be some resistance (ohms) there if the pump motor is okay.  Most commonly available voltmeters have the ability to measure resistance, or continuity.  Continuity means wiring is intact from point A to point B in a circuit, such as within your pump motor, and electric current can flow through it from battery to chassis ground unimpeded by a short, open switch, loose connection, or broken wire.  Most meters have a simple test option for continuity with an audible continuous sound if a tested circuit is intact and okay.  The voltmeter's onboard battery sends a low-voltage shot through one lead;  if it goes through the tested circuit and makes it back through the meter's other lead, then you hear the sound and all is well.  Theoretically.

If your pump's motor circuit tests okay, then the problem is likely upstream at a fuse or connection or perhaps a relay between the pump and the air system control unit, or perhaps a bad ground connection from pump to chassis.  Check your wiring diagram book to follow leads.

Tim Bentley:
I have on 03 Marquis with air leveling.  When the system needs air I can hear the pump come on and it may rum for 15 to 30 minutes before the leveling is complete.  Would it be possible to replace the current pump with one that puts out more air?  I have looked on line and cannot find a pump to make the replacement.  Does anyone know what type of air pump this is and where I might get a replacement with more capacity?

Tim

George Harwell:


Don't know if this will help but try HWH corp. in Moscow Iowa. They installed my system and the pump rarely turns on. 800-321-3494
Also be advised that the pump takes much longer to level the rear due to the increased weight.

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