Mine is a C7.
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I had a wonky gauge reading on one of my tanks and replaced the MMDC with a new one and the gauge continues go from reading correctly to dropping to about half of what the other one is reading. Happens randomly. I'm going to add the filters. Good idea. Any idea on the cause of the same gauge problem even after replacing the MMDC?Oh! Oh! Oh! I know this one.
99% likelihood the MMDC (Medallion Marine Data Concentrator) pressure transducer for the gauge is dead. Medallion made the mistake of putting the transducer inside the unit. But it can be repaired if you can locate a replacement transducer or harvest one from an ebay MMDC, etc. Every MMDC I have purchased has had one dead pressure transducer - Medallion and S&S/BAE didn't filter the air going into them and they get damaged from moisture and debris.
Here's the inside of the MMDC. You have to heat and pry the back off it's glue. It's VERY strong sealant:
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The red arrows indicate the pressure transducers.
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The board is secured into the case with some REALLY aggressive potting compound that's essentially impossible to remove. So I just snipped the legs close to the board of good transducer from a donor and soldered it to the legs still anchored to the board where I clipped off the bad transducer. This worked perfectly. I have not had any luck sourcing any of these Honeywell SX150D transducers and new replacements do not have the exact same specs so they would alter the readings at best...... so my solution was to find donor MMDC's for now.
To prevent future problems (and I haven't had any), I installed inline desiccant filter driers before the MMDC to filter and dry the air and hopefully prevent damage to the delicate transducers:
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I will snap some pics tomorrow.Looks like a C7 to me… Whats the dash look like? If it has the integrated/bussed gauges, you air pressure gauge issue just became a little more involved, as those sensors are soldered onto the board in the gauge controller module…
You installed a BRAND NEW MMDC? Or a "good" used one? I have not experienced what you describe. I would swap the air lines and see if the other gauge acts similarly to rule out some kind of supply pressure issue to the unit. If it stays with the same gauge after swapping the air lines front to back I would say you have a second bad MMDC. Every unit I have bought "surplus" has exhibited the same transducer failure issue. One of them legitimately had 35 miles on it and already had a bad transducer. These trucks sit and the air systems don't get drained leading to rust and moisture and any of that gets into the transducers and it kills them. Very poor design IMO that didn't account for the conditions these trucks experience in the real world.I had a wonky gauge reading on one of my tanks and replaced the MMDC with a new one and the gauge continues go from reading correctly to dropping to about half of what the other one is reading. Happens randomly. I'm going to add the filters. Good idea. Any idea on the cause of the same gauge problem even after replacing the MMDC?
You need to understand that the word "Classified" is not used in the normal way here. The info is not classified due to national security, (in 99% of the time) its a matter of the manufacturer not wanting to provide info to people like you. You are not in the military. You would be getting something for nothing. They spent millions on the design, and testing of the equipment. They provide the info in a manner specified by the military. It all cost big bucks. So why give it to you? No one is obligated to give you anything for free. If you want to get the TM's released for public use, then send a letter to the controlling Command, and request it. Few if anyone in the forum have ever done that. It might help if several hundred folks did that. Or write to the people of congress. Cant hurt.Any word on when they might declassify A1-A1R TM's?
The last place to look for the Changes, is the cover page. Back in the OLD days, when we received changes to a TM, the change came with a new cover. Someone then decided that was a waste of money, and when you consider the millions of changes were printed and sent out, yes it saved money. So what we were supposed to do is insert the changes, and then write in ink, on the cover, "Change #2, added 24.Nov. 1977". Then when change #3 came along, that would be written below. So everyone could see what changes were applied to the TM.TMs are a vast mystery to all but a few.
The A0 (June 1998 ) TM's were simply amended to add info for the A1 modifications (2005). The updated versions are difficult to find because they technically have the same numbers as the predecessors. I've never made heads nor tails of it, myself (fortunately one of my trucks came with a print copy of the later version).
The A1R TM's are still locked away in a wooden Raiders of the Lost Ark crate because "classified". Little black helicopters have long since whisked away anyone who had them off-base.
This is what the latest A0/A1 public release looks like. Is it posted here or elsewhere? No telling w/o a specific link...
*note that the cover page is the same as others but mentions the August 2005 amendments (I don't recall finding that amendment on any of the uploads here but it may or may not exist here on SS)
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This is a picture, I think, taken in Graf, here in Germany. I drove by the MP the other day and saw several of them being used for training.I gave up hope. As General said theA1R is essentially the P2 w/o the armored cab and thus civilian taboo.
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They should work fine with almost any version.Naw. All the one's I've used work just fine on Windows 10/11.
Yea, those look like the digital gauges, look for the MMDC box under the drivers dash, about eye level while standing on the ground when you open the door. Like In Generals pics, has 2 small airlines running to it. I suspect your power panel has 4 black modular relay/fuse boxes inside it. A1 variants notwithstanding, I believe you now posses what most would consider an A1R… R stands for Race, or “R” your pockets deep enough… CongratulationsHere’s the gauge panel.
I am no Einsten but conjecturing why any bafoon either in controlling Command or Congress would choose not to declassify vehicle technical manuals they regularly auction to the public is beyond me but; I kind of got the sense that it ain't because of national security.. As far as something for nothing, I bet there are plenty of people that would pay and the for profit corporations would oblige if they could turn a buck and not get into trouble.You need to understand that the word "Classified" is not used in the normal way here. The info is not classified due to national security, (in 99% of the time) its a matter of the manufacturer not wanting to provide info to people like you. You are not in the military. You would be getting something for nothing. They spent millions on the design, and testing of the equipment. They provide the info in a manner specified by the military. It all cost big bucks. So why give it to you? No one is obligated to give you anything for free. If you want to get the TM's released for public use, then send a letter to the controlling Command, and request it. Few if anyone in the forum have ever done that. It might help if several hundred folks did that. Or write to the people of congress. Cant hurt.
If it keeps acting up could we contemplate to bypass the circuit board transducers and install a simple in line pressure switch that would feed the alarm buzzer?I had a wonky gauge reading on one of my tanks and replaced the MMDC with a new one and the gauge continues go from reading correctly to dropping to about half of what the other one is reading. Happens randomly. I'm going to add the filters. Good idea. Any idea on the cause of the same gauge problem even after replacing the MMDC?
there are two or three main threads in here on how folk made their own own Manual CTIS control boxes. Ron's are the most recent.If it keeps acting up could we contemplate to bypass the circuit board transducers and install a simple in line pressure switch that would feed the alarm buzzer?