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Old 09-01-2017, 03:48 AM   #1
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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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Old 09-08-2017, 05:23 PM   #15
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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
John's a fairly busy guy. I'm pretty sure Tony (Isuzusweet) stays in touch with John so you might try contacting Tony to see if he's heard from him lately.
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Old 10-19-2017, 07:27 PM   #16
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Old 10-19-2017, 07:39 PM   #17
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It is possible, Mine had the wires potted into the module, yours has a connector. Yours also looks like it is mounted on the firewall near the rectifiers (I forget what they go to)
Mine is a stack of 2 modules hot glued to the dash between the speedometer and Tack.
You may either have the "left the lights on buzzer" or maybe the cruise control electronics?

Also interesting the date on this is Feb 1984, that means your rig was not built in 83 claiming to be a 84 model year like mine.
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Old 10-20-2017, 12:43 AM   #18
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Sorry for the crummy pic.
Iím home now so can post more info.
There was nothing between my speedo and tach that resembled you previous post.
This unit looked the most likely candidate and was mount to the steering column support I think, but it does not have a plug... the wires just disappear into the unit, and 4Ē or so away, they disappeared into a taped up blob. I cut that away and found multiple crimped(badly) connections into the harness.
I will let the pics do the talking....
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I have no idea if the above unit itís not it... I saw multiple other stuff that I was puzzled by Ike this thing!
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I heard that itís a nightmare behind there but mine is really ugly with lots of disconnected plugs, switches and free hanging wire that I intend to deal with before I begin driving this thing.
Speechless...
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Old 10-20-2017, 04:30 AM   #19
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Yours does not look so bad, mine has/had lots of splices that I assume Airstream did when it fitted the dash to the chassis. (First photo)


That could be one of the modules for the sensor lights but it does look different from mine.
If you zoom in on the second photo you can see where I labeled my modules. Note the blue connectors, I put them in to make dash removal a bit less insane of a task. A close up is in the 3rd photo)

I went a bit crazy with dash mods, Pop up LCD radio screen with video switching for two rear view cameras, digital dash dimmer.

This is my reworked schematic in PDF form http://theouterlimits.ws/projects/ai...d%20Wiring.pdf
You need to zoom in to get any detail.

That relay you found is probably the dead bolt relay, that is the only relay that was glued to my dash. I see a unhooked bare ended wire in that photo, I just love to find them and be clueless as to where they go, if anywhere!


BTW, almost everything on my dash was originally put in with a hot glue gun, including the relay, switches and indicator lights, many of them were coming loose. (4th photo)
When I went to upgrade to LED's, hot glue was what I used, just a stronger version.
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Old 11-01-2017, 07:17 PM   #20
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Ok. At Motorhome today and found another box.
This one is bigger and was screwed to the forward part of the dash under the heater duct. I couldnít reach the score so I just pulled on it and a piece of the frame broke off, but I donít care!
The unit is potted in resin by the look.

Here are some pics.
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Here are the wires where it crimps into the harness.
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Maybe you can ID it based on the wire colors.
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