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Old 08-07-2022, 10:26 AM   #1
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Freightliner instruments not working 1999 Winnebago Ultimate Freedom 38'

We bought a 1999 Winnebago Ultimate Freedom 38' last year. It had not been well maintained so I have been going through the issues one-by-one. The problem(s) I have remaining are related to the instruments. In short:
* speedometer/odometer do not work. Odometer did record about 2 miles in a 60 mile drive so there must be some connection.
* tach works when ambient temperature is below about 45. then slowly stops working as the vehicle warms up. in the same 60 mile drive, it worked for about the first 15 miles then slowly started falling until it read 0.
* fuel gauge shows full when tank is full. Shows empty when tank is 1/2 full. Bounces like crazy when driving down the road and hit a bump
* cruse control WORKS.
* instrument panel has been tested and showed no problem.
* installed a Scan Guage in the OBD port (6 pin). Tach and Speedometer readings are perfect. Fuel consumed even appears to be accurate.

So I am assuming that all of the sending units are most likely working properly, with the possible excepting of the fuel. That would lead me to a poor connection/bad ground somewhere between the sending device and the dash. What I think I need to know is where the sending unit is for these signals and a pinout for the big plug in the instrument panel that would tell me what pins the tach, speedo and fuel signals come in on. This is on a Freightliner chassis (1998) with a Cummins turbo 350. Can anyone please help me with getting this information? Any other helpful suggestions would be welcomed.

Thanks.
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Old 08-10-2022, 09:52 PM   #2
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Just responded to a similar issue with a 2002. And we had it. Freightliner had a stealth recall on the twisted wire harness leading to the gages back in 2010, I believe. We were able to get them to honor the recall in 2019 and replace our harness (actually, WWWilliams did, but.....) Others bought a new harness and installed it themselves. The harness is small and (dare I say it) intuitive to self install.

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