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Old 07-25-2008, 04:45 PM
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Unusual Vehicle Gauge Problem.

2007 Freightliner Century S/T tractor.

When the key is turned on from off or accessory the gauges do a default sweep to maximum then minimum then to the position where the gauges are reading accurately, every time, this is factory default.

I have been losing the speedometer, tachometer, water temperature, and oil pressure, and evidently these are also somehow linked to the odometer, as it stopped registering, but still read the last registered mileage.

I had it in the Freightliner dealer for service twice in the last week and a half, but it was in for this particular problem just 2 days ago, and the technician found nothing more than a possibility of loose wire harness connections. He had the diagnostic computer hooked to the truck, and found nothing- and could not re-create the problem and worked on the truck for over 5 hours.

I drove it nearly 2 full days, and almost 1000 miles before it started again, and this time I noticed that driving over rough pavement in a construction zone with a heavy load, (I'm just over 78,000 pounds with the current load) the heavy jarring seems to have knocked something loose, or whatever and I lost all four along with the odometer freezing again.

The speedometer is not in this alone, so I am ruling out it being the culprit, just another victim of the problem.

I am just wondering if anyone has any class 8 vehicle experience, and might have heard of this problem, I had the technician stumped, same as our company service manager.

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Old 07-25-2008, 07:03 PM
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that is a strange one. you might try posting at http://www.thedieselgarage.com/ in the heavy duty truck section, lots of heavy truck mechanics hang out over there.


disclaimer: not my website, just trying to provide a place to get his question answered.
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Old 07-27-2008, 10:57 AM
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Thanks, I'll have to add that to my long list of sites I try to frequent.

Even stumped two service technicians now, I stopped in at the service point that performed my "B" service just last week, with no result.
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Old 07-28-2008, 04:32 PM
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re

It must be something common to all these gauges, so if ther is a common power connection track that. The IP ground also comes to mind, as many forget the other half of the circuit...
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Old 08-06-2008, 05:32 PM
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I have also gotten a response from another board I belong to from a Freightliner technician, he stated a possibility of a central dash wiring cluster- and he stated what to look for and how to find it if it's within reach after removing the outer dash panels, I just have to find the time off to look at it.
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