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Old 03-11-2007, 10:15 PM
300SD81's Avatar
1981 Mercedes-Benz 300SD
Join Date: Aug 2006
Location: University of Georgia
Posts: 1,080
Jumping/No Speedo

My speedometer has been jumping around for a while. I'm not sure if its a wiring issue or if the speedo itself is messed up. Does anymoe know what kind of signal the speedo gets? Pulsed, voltage, resistance, ect? I have an oscilloscope and serveral volt and ohm meters to test with. I'm suspecting the speedo itself because I can give it a hit, and it'll start working for a few seconds. But using a tester from the connector in the left of the center console to the connector at the gauges, the wire was always connectd no matter how i shook it...

Ich liebe meine Autos!

1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete
1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday...
1981 Mercedes-Benz 300SD | Rear ended, retired in garage.
2009 Yamaha AR230HO | Das Boot

Excessive speeding? It ain't excessive till I redline!
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Old 03-12-2007, 12:36 AM
190d 1985
Join Date: Sep 2006
Posts: 92
My car does this also. Which is one reason why I have a GPS unit in the car.

190D 1985 254,703 Miles as of 3/25/2007
Bought her on 10/4/2006 with 241,132 miles
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