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Old 10-03-2020, 07:01 AM   #1
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Compressed Air Outlets???

I've got an '05 4024 DS with a pair of compressed air outlets at both the back and front of the coach. I can't really trace what their smallish(1/4" or so) plastic lines are hooked up to but tested them with the engine running and there was NO air pressure there.
Are they coming from the generator somehow? I know, why don't I run the generator and find out? Well, I can't do that RIGHT NOW in the campground and a great deal has come up on an air source for filling my tires and I need to act quickly.
Anyone familiar with these air outlets? Not sure they came with the coach.
Any help would be appreciated.
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Old 10-03-2020, 07:44 AM   #2
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Were the tank pressures over 75 PSI when you checked them ?
Protection valves stop the flow of some, to save the air for the brakes.

Did you try stepping on the brake, while testing the rear one ?
Some lines are run to the rear for toad braking.

One in the front may only be for air " IN ". That's so a tow truck can fill the tanks to tow it.

I have never heard of a power generator with a compressor on it.
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Old 10-03-2020, 08:12 AM   #3
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It may have been an aftermarket add-on. Perhaps someone added a small compressor, and ran the lines themselves to make two service points. Might look for wires coming off one of the battery banks, or a new breaker or fuse added off on of the house relays. I would imagine they put a switch in somewhere.
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Old 10-04-2020, 08:15 AM   #4
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Thanks for your inputs!
Twinboat, I believe it IS for towing as the front one is wire loomed and included in an array of cleanly zip-tied wire loom encased connections. Looks factory installed to me so I've surmised its for air input for towing.
Bought the Viair unit yesterday.
Thanks, again.
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Old 10-06-2020, 12:06 AM   #5
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Having had the pleasure of being towed when the Cummins went down, I can tell you the front air connection is for the towing truck to connect and inflate the air bags. I saw it being done and the PSI gauge went up to over 75. I have also tried to use it to inflate my tires. But it only goes to 125 PSI when I need 130. I have yet to find the back one.
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Old 10-07-2020, 05:49 AM   #6
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Quote:
Originally Posted by mahdi View Post
Having had the pleasure of being towed when the Cummins went down, I can tell you the front air connection is for the towing truck to connect and inflate the air bags. I saw it being done and the PSI gauge went up to over 75. I have also tried to use it to inflate my tires. But it only goes to 125 PSI when I need 130. I have yet to find the back one.
In addition to air bags...a very important item is being able to release the spring brake (Parking Brake).

For airing up tires...an air "doubler" is essential.

It uses air pressure to create more air pressure. This ine does 2x...vut they also make a 4x in this size. Mine has a regulator on the input that puts out 80psi...then the doubler takes over and outputs 160 psi. The TEE with the quick connect has an overpressure relief safety valve. Nice device to have...mounted mine in a convenient place so it's not taking up valuable basement storage.
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Old 10-07-2020, 05:54 AM   #7
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I'm not sure of the year...but Spartan Chassis now come with an air brake connection on the back near the tow receiver for connecting to a toad with an AF1 brake actuator. I'm sure that's not what was on the 2005, inless added by the owner.
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