I have never been fan of MB cruise control since it does not seem to work on about 90% of the MB's from the 80's. On my 1980 wagon the cruise does not engage when you lift the actuator lever, however when you hold and maintain the lever up the car accelerates, right up until you let the lever go, then it disengages. My question is: what went bad? Does this mean that my cruise control amp is no good, actuator or control switch? Or could it be still something else? Thanks a million in advance.

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Andrew Villasenor
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1984 300D turbo 5-speed manual(daily driver)
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Sounds like the classic symptom for cruise control amplifier failure to me.

Yep, the SDL has started to do the exact same thing. Time to find another cruise control amp, or have these guys rebuild it:

http://www.gdl-online.com/begin.html

BTW, the replacement cruise control didn't work at all.

My CD started doing that. ANd sure nuff it was the amp.

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.

Probably amp failure. Could also be actuator failure though the symptoms are typically no actuation at all. I have a spare actuator I can sell you if you need.

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1984 300Sd 210k

Former cars:
1984 300D 445k (!!) (Strider) Original (and not rebuilt) engine and transmission. Currently running on V80 ( 80% vegetable oil, 20% petroleum products). Actually not, taking a WVO break.
1993 300d 2.5 275k. Current 120/day commuter
1981 300SD 188k (Hans) Killed by a deer

Where is the cruise amp? Is it the unit that is slightly below the acctuator on the RHS inner fender?

I would suggest S-canning the entire OEM cruise control system and retrofitting an aftermarket version if you want to have a reliable system. There's a few threads about making a conversion if you can find them, the threads that is.

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DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012

It might be there if you had an Oldsmobile.

Ok, my 240d has pretty much the same problem, the cruise will "kick in" when you hold the set/accel, but as soon as you release it quits. I "resoldered" the amp and now it doesn't work at all.

Does anyone have a schematic to help me debug the connections/switches? I don't have another amp to try, so I want to make sure that it is the problem before I shell out the $$$ for another one.

Thanks.

mine hunts on a slight down grade at some speeds.
everything else works fine! with the cruise I mean!
could this be the amp?

rather than start a new thread i figured i'd ask my question here:

when my cruise control is engaged [87 300E] the car seems to do this surging routine. it manages to maintain the desired speed more or less, but the tach keeps jumpin'. what could this be??
thanks.

oh yeah, and how does one gain access to the cruise ctrl amp?

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1987 300E - champagne
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