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Old 12-05-2008, 09:03 PM
burford's Avatar
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Join Date: Dec 2005
Location: Franklin, NC
Posts: 64
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 .

1984 300SD 175,000 Miles
1987 GSXR 1385cc
1985 GSXR Limited Edition 750cc
2005 Suzuki Burgman 650cc
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Old 12-05-2008, 09:43 PM
dieselnutnj's Avatar
Join Date: Jul 2008
Location: Newton NJ
Posts: 163
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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Old 12-05-2008, 09:44 PM
oldiesel's Avatar
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Join Date: May 2007
Location: florida
Posts: 677
maybe speedo cable,if the cruise uses a signal from the speed sensor on the back of the speedo. Don
Red Green "This is only temporary,Unless it works!"

97 E300D 157000 miles
87 300TD ?141k? miles
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Old 12-05-2008, 09:48 PM
LUVMBDiesels's Avatar
Dead on balls accurate...
Join Date: Aug 2006
Location: Red Lion,Pa
Posts: 2,207
Things to check


Speedometer drive on transmission

Speedometer wire from transmission to instrument cluster

Connection on speedometer

Ground connections on instrument panel

Good luck!
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

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'74 Jeep CJ5
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Rudolf 86 300SDL
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Old 12-06-2008, 03:41 AM
Actros617's Avatar
Ich fahre dieseltypen
Join Date: Apr 2008
Location: Oklahoma
Posts: 1,103
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
Benz's in our garage
2008 E320 Bluetec 127k mi

1987 300SDL 200K+
1994 S320 181K mi


1995 E320 Special Edition [Rear ended]
1984 300SD [Head on collision]
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