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#1
08-10-2010, 08:41 PM
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How do I check the cruise control switch?
I want to find out if my cruise control switch is OK before putting in more expensive parts.
I did a conductivity test on it and these are my results. Pin combination Conductivity Lever Position 1-2 Yes Neutral, Off, Resume, Accel. Set, Decel.Set 1-3 Yes Decel. Set 1-4 Yes Accel. Set 1-5 Yes Resume 2-3 Yes Decel. Set 2-4 Yes Accel. Set 2-5 Yes Resume 3-4 No 3-5 No 4-5 No I’d like to know are these readings normal or do I have a short?
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 81' 300TD Peter 
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#2
08-10-2010, 09:40 PM
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I cannot tell from what you have posted as it has been quite a long time since i was working on my cruise control. I would suggest that you go to http://gdl-online.com where you will find very good instructions for checking out your CC before you go blowing alot of money guessing. Don
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Red Green "This is only temporary,Unless it works!"  97 E300D 157000 miles 87 300TD ?141k? miles
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#4
08-11-2010, 12:09 AM
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Answer
Quote:
http://www.peachparts.com/shopforum/diesel-discussion/123036-cruise-control-repair-articles.html#post883130
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#6
08-11-2010, 01:00 AM
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Does the linked info cover the W124?
The '87 has no CC. Not sure what to check first. The tach is inop if that means anything for this purpose.
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83 300TD (need rear wiper assembly dead or alive) 84 300SD Daily driver 85 300TD almost 400k miles and driven daily. 98 E300D *sold 86 300SDL *sold and made flawless 10 hour journey to new home. 
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#7
08-11-2010, 01:42 PM
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Well I checked the CC circuit per GDL and it appears that the actuator motor is shot. The ohms readings between pin 9&12 and 9&13 was infinity not 3.4K and 0 ohm as per spec.
The motor test failed completely. It was supposed to read 130 - 180 mAdc but I got 0.00 and no sound from the actuator. Guess It's a off to the shop for my actuator and amp. Better get to work so I can pay for it.
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81' 300TD Peter
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#8
08-11-2010, 01:49 PM
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The GDL guy is as nice if not even nicer (is that possible?) than the guys here on this site. His name is peter, and he is awesome. Incredibly helpful.
__________________
 77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)  83' 300SD, "The Superdon" 325k+ @ 28mpg 95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg 95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head  99 Suzuki Intruder "Trudy" @ 45 mpg
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