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Old 01-25-2003, 09:03 AM
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Talking tachometer and cruise control connection?

Hello all:

Tach is dead on 1983 300SD -- cruise control will accelerate but not control speed are these two issues connected. Have 560 SL but LOVE my diesel!!

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Old 01-25-2003, 03:34 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,877
I have noticed the same thing on my 300TD. When the cruise isn't working neither is the tach. There is a relay behind the passenger side, side kick panel. I have re-soldered a spare relay for this location but have not put it in yet. Maybe someone a little more familiar with the circuitry will speak up.
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Old 01-25-2003, 06:53 PM
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Cruise and tach tied together

Thanks for the info. How can we put our hands on a the schematics? I also have problems with the aux fan never engaging. Clutch 4.5 ohms -- I suspect ok. Measured >1 Vdc while engine is >80C. 70MPH will generate >100C heat after 1 or 2 mins.

Any ideas?

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Old 01-25-2003, 06:59 PM
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Join Date: Sep 2001
Location: central Texas
Posts: 17,277
Can you take yours apart and photo the circuit board and the other side ? Hopefully from the same distance... and put a mark on two sides 90 degrees from each other when you photo it...should be able to make a schematic from that... and careful reading of the markings on the resistors, etc....
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