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Old 09-01-2017, 03:48 AM   #1
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1984 27' Airstream 270
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Dash sensor modules schematic

This has been bugging me for some time now, on my 84 MH the low coolant & water in fuel lights come on intermittently. I know it has nothing to do with the sensors, especially since mine is gas and there is no water in fuel sensor!
The sensors connect to two potted modules attached to the dash as shown in this diagram.
I had done a search in the past to try and find a replacement or at least a wiring diagram of the internal components, with no luck.

Does anyone here have a schematic of the internals of these modules?
OR
Does anyone have a old one that they do not need?
I would like to dissolve the epoxy and trace out the circuit so they can be duplicated (and made to function properly)
Although they could be designed from scratch, I would like to duplicate the original. I have made PC boards and if I can get a working design, I can post the info here.
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Old 09-03-2017, 08:49 AM   #2
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Anybody?
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Old 09-03-2017, 11:35 AM   #3
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Wayne,

I think this is a subject most of us just complain about but never look into!

My guess is you'll probably be in virgin territory the whole time

Brad
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Old 09-03-2017, 12:14 PM   #4
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Quote:
Originally Posted by bkahler View Post
Wayne,

I think this is a subject most of us just complain about but never look into!

My guess is you'll probably be in virgin territory the whole time

Brad
Thanks,
I dont want to dissect mine, hoping someone has one that they pulled out and threw on the shelf will all the other parts we seem to not be able to dispose of.
I have epoxy dissolving juice at work, and I assume the circuit is just discreet transistor stuff. I will need to avoid dissolving the numbers off the parts.
Maybe some old timer at Airstream engineering has the original diagram?
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Old 09-03-2017, 01:50 PM   #5
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I think those electrical engineering drawings existed at some point.

There was no manual for the 250. You got one for the 290/300/350 series. However, I have five loose sheets in my 1991 manual which are specific to the 250.

The electrical ones are really high level and I've seen similar for other coaches. However, I think the gas and plumbing are more specific technical drawings. I'd be interested to know if people have this detail in your manual.

If not, perhaps there is a repository in Airstream Engineering. It would be a huge benefit to everyone if we could get some of these drawings out of the engineering and technical division, although I suspect very difficult to achieve.

cheers
Nick
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Old 09-03-2017, 02:20 PM   #6
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Your pages look crisp!
Some of that is out there on the web, here is the 1984 310 service manual
http://campkahler.com/files/310-service-manual.pdf
Mine is a 84 Excella 270 and I do have the original service manual, but it is fragmented, kind of like someone in the office asked the production engineer to "make a manual" so they threw together what they had and added some text. I know, I have done that before. It is a help but nothing like a service manual you use to be able to get from GM.
I would love to get my hands on original drawings and schematics and scan them for everyone to be able to reference. It sure beats reverse engineering it all.
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Old 09-03-2017, 02:35 PM   #7
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Your pages look crisp!
Some of that is out there on the web, here is the 1984 310 service manual
http://campkahler.com/files/310-service-manual.pdf
Mine is a 84 Excella 270 and I do have the original service manual, but it is fragmented, kind of like someone in the office asked the production engineer to "make a manual" so they threw together what they had and added some text. I know, I have done that before. It is a help but nothing like a service manual you use to be able to get from GM.
I would love to get my hands on original drawings and schematics and scan them for everyone to be able to reference. It sure beats reverse engineering it all.
Yup, I've asked on the forum before but Brad's is the only example of the Airstream Service Manual I have seen. if anyone has one of those for the 290/300/350 series, then please let me know. I'm not after the standard buyer's coach manual.
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Old 09-04-2017, 06:05 PM   #8
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Thanks,
I dont want to dissect mine, hoping someone has one that they pulled out and threw on the shelf will all the other parts we seem to not be able to dispose of.
I have epoxy dissolving juice at work, and I assume the circuit is just discreet transistor stuff. I will need to avoid dissolving the numbers off the parts.
Maybe some old timer at Airstream engineering has the original diagram?
Wayne, send a PM to John (shepherd57). He has the remains of the dash from the 345 I dismantled.

Brad
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Old 09-08-2017, 05:36 AM   #9
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Following this. I too have lights on my dash that randomly come on!
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Old 09-08-2017, 05:49 AM   #10
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I tried the PM to shepherd57 and no reply yet. If anyone has a bad or unneeded module I will pay for it so I can reverse engineer it and post a schematic
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Old 09-08-2017, 05:56 AM   #11
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Electrics are my weak spot so how the unit works will probably go over my head.
Where is the unit located and any idea what it looks like?
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Old 09-08-2017, 06:28 AM   #12
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On mine there are 2 modules stuck together and to the back of the dash between the Speedometer and the Tachometer. You can see them in this photo:
The one that is messing up on mine is called the fluid sensor module, it has the low coolant, water in fuel and washer fluid low. The other module handles the pressure temperature sensors, and so far that one is behaving for me. If I get both, I will figure out the wiring for both. If it is fairly easy I can even design and make replacements for them both
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Old 09-08-2017, 10:38 AM   #13
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Got it!
I will take a look next time I am over.

Any down side to unplugging and removing the unit?

I do know that the coolant and washer fluid low level sensors look to be simple level sensor units similar to what is used in the fresh water and waste tanks.

There are 2 in each reservoir, with one connected to ground, and the other I assume going to the sensor unit we are discussing.

Is there any idea who made these units? I dont think it was GM, so maybe some other aftermarket company?
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Old 09-08-2017, 11:55 AM   #14
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The diagram shows connectors but mine was hard wired in. I would not remove it unless you had something ready to replace it. You either need to be a contortionist or pull the dash part way
I assume there is circuity similar to the water tank sensor, but I wont know until I can get my hands on one.
I do recall the name on a label on one of the modules, I looked it up but hit a dead end
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