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  #1  
Old 07-26-2019, 01:00 PM
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Join Date: Jul 2019
Posts: 27
DESPERATE HELP! Cruise Actuator

The cruise on my 85 300TD suddenly stopped working a few days ago. I immediately noticed the cruise actuator in the engine compartment was "clicking" whenever I turned on the ignition key (and not using the cruise stalk) before the car actually started. If I unplug the cruise box, the clicking stops. I have done the following without any idea what the problem is.

1. Replaced the cruise box with a rebuilt known good one from our buddy "JamesDean".
2. Tested power to each pin at the box from the stalk.
3. Tested actuator at plugin.
4. Replaced the actuator with a known good one to be certain (checked by James Dean).
5. Exchanged the computer module on the passenger kick panel (only on 85 models).

The problem remains with the actuator ticking away whenever the ignition is on (even before the car starts). I need someone smarter than I to help as I am out of ideas!!!
I just spent 2 hours searching the net with no answer. This is a known problem, but there are NO solutions found!

Richard

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  #2  
Old 07-26-2019, 02:02 PM
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Join Date: Feb 2008
Location: Atlanta, GA
Posts: 3,816
Check your brake lights and tail lights; a burned out bulb might create a problem.
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  #3  
Old 07-26-2019, 05:18 PM
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Join Date: Oct 2007
Location: Greater Metropolitan Beaverdam VA
Posts: 2,860
James Dean offers, at no charge, an easy to follow step by step fault isolation procedure. It requires a voltmeter.

IRT the tail light bulb, true dat. The cruise uses stop lamp activation to disengage.
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  #4  
Old 07-26-2019, 05:35 PM
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Join Date: Sep 2013
Location: Alhambra California
Posts: 3,129
If the stop lamp bulb does not have the proper resistance the cruise control will not operate.
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  #5  
Old 08-27-2019, 06:52 PM
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Join Date: Aug 2019
Posts: 5
Smile Cruise control schematic and component layout

Recently, I repaired my 1984 300tdt cruise control. I reverse engineered
a schematic and was able to repair and bench test the unit. Works fine now.


If you wish, send me your email, and you are welcome to what I have. Please
note that there maybe some errors, but all in all it should assist you if the
fault is in the electronics.


Mariano
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  #6  
Old 08-28-2019, 11:18 AM
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Join Date: Jul 2019
Posts: 27
Mariano,

VERY interesting! I would SINCERELY appreciate it. My email is benzjag@hotmail.com.

Richard
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  #7  
Old 06-14-2023, 03:08 PM
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Join Date: Oct 2022
Location: DFW area
Posts: 109
bumping an old thread, but if possible I would like to get the schematic also.

email: AF5XF@protonmail.com

Thanks, Matteo

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1980 N/A 300D with 240d ACC and sanden unit, 281k miles, has a 617.951 turbo motor installed and a 4 speed standard in its future.
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