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Old 07-29-2015, 09:31 PM   #99
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My new viair pulls up to 29amps, the model you had mentioned is similar
I believe. I think the safest and most reliable method to wire that compressor is with your ignition wire activating the relay only and then a heavy gauge wire direct to the battery with inline fuse or breaker of appropriate size. Airstream used a very small oem compressor and ran a #12 wire from the ignition all the way back to power it. No bueno.
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Old 07-29-2015, 10:52 PM   #100
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Here is the page from my Airstream manual and you can see the air bags, a/c heater and wipers are 20 & 25 amp fuses through the ignition switch.

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And yes I run my compressor from the battery through a relay triggered by the yellow wire from the fuse box.
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Old 07-30-2015, 06:01 AM   #101
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Rivet The collective knowledge is impressive

Thanks everyone and thank you Dan for posting the fuse block layout.
The chassis on my 83 is an 82, but the Coach appears to be a very late 83 according to the Airstream vin. It has the later model dash, aluminum rims, powerseats and even some oak upper cabinets in the rear that were not used until 84 as far as I know.
By then they may have realized the weakness of the spade type fuse protected compressor circuit and installed a circuit breaker fuse.
I will follow every ones recommendation and only use that existing circuit for the relay and run a #8 from the chassis Bat to small 12v distribution block in the rear.
onward through the fog...
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Old 07-30-2015, 08:32 PM   #102
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Digging deeper

Quote:
Originally Posted by mayco View Post
.....
Is your tank still in place or are you going to have to install a new tank also? Not sure if you know or not but the oem set up had 2 air lines from the tank to the compressor set up. One line was supply from the compressor to the tank and the other line was from the tank to the pressure switch.........

Mike
Yes, Tank is in place, but what a mess someone made
Instead of a drain valve on the bottom, its been used for the manual supply line. Tank is prob half full of water.
One side of the T on top goes to the air bags the other side goes to ...drum roll....back into the tank via the original compressor input fitting
check out the plumbing on that fitting.
who sells hose and different fittings? home depot ?
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Old 07-31-2015, 05:44 AM   #103
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Now that's ugly

Some PO did the same thing to the bottom of the tank on the 310. I thought that was rather odd since there was a quick connect in the electrical compartment that could have been used just as easily.

Brad
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Old 07-31-2015, 06:22 AM   #104
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I havent tried these but was tempted when I was redoing my compressor system.

Plastic Push-To-Connect Tube Fittings | MSCDirect.com

Or,
http://www.summitracing.com/search/p...-hose-fittings

Or,
Pneumatic Fittings and Couplings - Pneumatics - Grainger Industrial Supply

I had a difficult time finding proper tube fittings locally. Our "Do it Best" had some fittings but limited selection.

Mike
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Old 07-31-2015, 06:59 AM   #105
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Quote:
Originally Posted by PeterH-Airstreamer View Post
I will follow every ones recommendation and only use that existing circuit for the relay and run a #8 from the chassis Bat to small 12v distribution block in the rear.
onward through the fog...
After reviewing the installation that I did on the 310 for the compressor wiring upgrade I realized that I didn't run a wire from the coach batteries to the compressor I ran the wire from the generator compartment to the compressor.

I used a #10 wire connected to the starter solenoid of the generator and ran it across the chassis to the compressor. For some reason I didn't fuse the #10 wire so I will be doing that this weekend. Not sure how I missed adding a fuse inline

Brad
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Old 07-31-2015, 01:15 PM   #106
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Mike try a truck parts supply house. They have lots of tubing stuff for air suspension and air brake systems. The push on fittings are just an air version of a Shark bite fitting.
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Old 08-01-2015, 08:01 AM   #107
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I may be overthinking this:
Would it not be better to let the ignition power first go to pressure switch, which then will power the relay to open the new bat circuit for the compressor?
Otherwise the relay would get a lot more use and would be energized at all times.
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Old 08-01-2015, 08:45 AM   #108
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Yes, if you use a separate pressure switch and relay. You power the pressure switch and it triggers the relay. If you run power direct from the battery, one side of the relay is hot all the time, when the pressure sw calls for air it will trigger the relay to close and contact is made sending the batttery power to the compressor. Another reason I like the pressure switch/relay combo from viair. Very simple to wire, compact design, sealed unit so resists moisture.

Mike
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Old 08-01-2015, 08:47 AM   #109
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Viair 85 105 PSI Pressure Switch Relay Combo Train Horns Load Support | eBay
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Old 08-01-2015, 10:20 AM   #110
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Quote:
Originally Posted by PeterH-Airstreamer View Post
I may be overthinking this:
Would it not be better to let the ignition power first go to pressure switch, which then will power the relay to open the new bat circuit for the compressor?
Otherwise the relay would get a lot more use and would be energized at all times.
The only extra use it would get is if you have a slow leak. The compressor would run periodically to keep the suspension up.

With that said, Airstream powered the compressor from the ignition circuit on most rigs. Not sure why yours went to that particular circuit breaker as I think that one has power all the time.

Personally I prefer to power the relay or pressure switch (doesn't matter which) from the ignition circuit and the N.O. contact gets power from either the chassis or coach battery which then feeds the compressor.

Brad
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Old 08-01-2015, 10:30 AM   #111
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Quote:
Originally Posted by bkahler View Post
... Not sure why yours went to that particular circuit breaker as I think that one has power all the time...
Brad
Haven't had time to trace that orange wire feeding the circuit breaker, but it only gets power with the ignition on.
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Old 08-08-2015, 09:55 PM   #112
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Finally got all the parts together to complete the compressor install. I found compression fittings and air line at Home Depot and they work great.
The only problem I had with the fittings was at the compressor. The braided compression line ViAir supplied was not long enough to go from the Tank to the mount location and I made the mistake to use it on the tank side and add plastic line to the compressor. At 90 pounds the hose will just blow off, because of all the heat generated close to the fitting. I will have to reverse that tomorrow or find a longer hose.
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