| Help identifying a wiring harness? [message #97631] |
Sat, 28 August 2010 11:04  |
MikeT
Messages: 225
Registered: November 2009
Location: Marine City, Michigan
Karma: 0
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Hi Folks,
Built some ramps thanks to the plans put on the photo site by Kelvin. Got under the coach to fix a few things with the holding tank and break lines.
There is a long wiring harness behind the waste tank that was all tie rapped together and I don't know what it is. First I thought it was for trailer lights when towing but now I don't think so.
The main wires go forward from the harness but three break off and go to a cylinder type object which turns into one wire that goes to a small fill tube that enters the waste tank. The small fill tube is only coming out of the tank about one foot and it is cut off.
Not sure what it all is but my guess would be that the PO had a macerator pump that was removed.
Attached is the link to the four photo's I took hoping someone could identify.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=35620&title=unknown-wiring-harness&cat=500
I also have to assume that the fill hose will need to be capped or it looks like it will drain overboard once the waste tank is half full.
Thanks for you help.
Mike Thomas
Marine City, MI
77 ex Palm Beach
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| Re: [GMCnet] Help identifying a wiring harness? [message #97668 is a reply to message #97640] |
Sat, 28 August 2010 20:20  |
MikeT
Messages: 225
Registered: November 2009
Location: Marine City, Michigan
Karma: 0
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Thanks Emery. I have no need for it but concerned about how to get the sensor out of the tank for your friend. The electrical is easy but not sure I want to mess with the tank. It leaks enough already.
Mike Thomas
Marine City, MI
77 ex Palm Beach
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| Re: [GMCnet] Help identifying a wiring harness? [message #97688 is a reply to message #97675] |
Sun, 29 August 2010 00:05 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| mcolie wrote on Sat, 28 August 2010 20:04 |
Mike,
As the last engineer on the Thermasan program, ...
<<snipped>> ...
If the coach still has a speed switch in the cable, let me know as someone is looking for one of those.
Matt
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Mike,
I thought it might have been a Thermasan tank probe, but it didn't look exactly like the one on my '73. I knew we have someone who had been involved with the company who made them (Matt) so I didn't comment.
There are other parts that you might look for on your coach. Here are pictures of the incomplete system on my 1973: <http://www.gmcmhphotos.com/photos/showgallery.php?cat=3741>
Your parts my or my not look like mine. But just knowing what all the odds and ends that are installed on your coach (usefull or not...) is a good thing.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Help identifying a wiring harness? [message #97773 is a reply to message #97675] |
Sun, 29 August 2010 21:11 |
Russell Mehlenbacher
Messages: 128
Registered: June 2010
Karma: 1
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Matt,
When was a teenager, the inventor of the level sensor (blue cylindrical,
three wires in, one out) brought the prototype or preproduction version over
to show my father. RFI sticks in my head, maybe it meant Radio Frequency
Interference? I think the probe was a simple rod, but could have been a
tube. We were all amazed that switching or indicating could be accomplished
with a non contact system...
So I'm suggesting that the tank probe was probably pretty simple antenna.
Russ
On Sat, Aug 28, 2010 at 11:04 PM, Matt Colie <mcolie@chartermi.net> wrote:
>
>
> Mike,
>
> As the last engineer on the Thermasan program, I can assure that Emery is
> completely correct (like that is any kind a surprise..).
>
> He is right about the tank pickup probe, that is the older version. I am
> struggling to remember how it is assembled. I do remember that we had a box
> of Well-Nuts to plug the hose in test tanks. I'm sure if you can get the
> probe out, you can find a right sized Well-nut to plug the hole but I can
> not help you with sizes. - Sorry
>
> If the coach still has a speed switch in the cable, let me know as someone
> is looking for one of those.
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumiere (say show-me-air)
> SE Michigan - DTW 3.2/4R
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
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Russ & Linda Mehlenbacher
Rochester Hills, Michigan
'76 Eleganza
'74 Sequoia
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| Re: [GMCnet] Help identifying a wiring harness? [message #97782 is a reply to message #97773] |
Sun, 29 August 2010 21:47 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| Russell Mehlenbacher wrote on Sun, 29 August 2010 22:11 |
Matt,
When was a teenager, the inventor of the level sensor (blue cylindrical, three wires in, one out) brought the prototype or preproduction version over to show my father. RFI sticks in my head, maybe it meant Radio Frequency Interference? I think the probe was a simple rod, but could have been a tube. We were all amazed that switching or indicating could be accomplished
with a non contact system...
So I'm suggesting that the tank probe was probably pretty simple antenna.
Russ
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Russ,
I had more than a few long talks with the guy that both invented the unit and ran the company.
It was really much more simple than that. The contact in the tank and the lead to it were parts of a tuned circuit that was simply detected. When any thing contacted the pickup (or two -in later designs), that oscillator fell out of tune with the detector. They were anvil reliable.
I have to get to cleaning out my barn, I probably still have one.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Help identifying a wiring harness? [message #98600 is a reply to message #97782] |
Sun, 05 September 2010 02:57 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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[quote title=mcolie wrote on Sun, 29 August 2010 21:47]| Russell Mehlenbacher wrote on Sun, 29 August 2010 22:11 |
I have to get to cleaning out my barn, I probably still have one.
Matt
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I have a Thermasan on my '74 and will be making sure it works (CFO is VERY interested in it working, don't ask). I am interested in accumulating spare parts such as the sensors to make sure I can keep ours working. So if anyone has such parts available I am interested.
BTW the "temperature" sensor shown in the photos is really a vacuum switch that determines the engine is under load and thus the exhaust is hot enough.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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