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  #1  
Old 12-05-2008, 08:03 PM
burford's Avatar
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This one has me puzzled

My speedometer and cruise control went out at the same time on my 84 300SD. I have tried to figure out what is the common denominator. The only thing I can think of is the cruise amplifier. Can anyone help me out on this one? Any thoughts will be appreciated .
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  #2  
Old 12-05-2008, 08:43 PM
dieselnutnj's Avatar
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the cruise picks up the speed from the speedo which I believe is electric on your car? Check your connections on and around the speedo, and then check at the rear of the trans on the drivers side to make sure the wire didnt come off trans. Cruise amp will only effect Cruise, not Speedo, but a defective speedo will stop both from functioning.
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  #3  
Old 12-05-2008, 08:44 PM
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maybe speedo cable,if the cruise uses a signal from the speed sensor on the back of the speedo. Don
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  #4  
Old 12-05-2008, 08:48 PM
LUVMBDiesels's Avatar
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Things to check


Fuse

Speedometer drive on transmission

Speedometer wire from transmission to instrument cluster

Connection on speedometer

Ground connections on instrument panel


Good luck!
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  #5  
Old 12-06-2008, 02:41 AM
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Quote:
Originally Posted by oldiesel View Post
maybe speedo cable,if the cruise uses a signal from the speed sensor on the back of the speedo. Don
300SD dont have speedo cable... they are electronic
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