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#1
11-19-2019, 01:04 AM
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Speedometer/odometer failure causing cruise failure
Recently picked up a very solid 300sdl from 1986. Plenty of small fixes but I believe it to overall be a great find. The speedometer and odometer are both not working. It has become my understanding that this is pretty common. While I’ll fix them eventually, I’m wondering if the speedometer being out caused the cruise control to also go out. Seems likely, but wanted to ask the community. I can live without speedometer and odometer for a while but it would be niiiiiice to have working cruise control. Whatcha got?
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#2
11-19-2019, 08:46 AM
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Yes of course if the speed sensor is out the cruise control will not work. It still may have other issues as well. To repair before the cruise control system is working.
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#3
11-19-2019, 08:51 AM
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Yes MBs of that era used a pickup off the back of the speedometer for vehicle speed reference. This was used for not only the cruise but also fed into the outside temperature display, audio system, and climate control.
__________________
The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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