It's probably the amp but could be bad connections. I had a similar problem on my 82 300SD that turned out to be a dirty connection on the back of the speedo assembly that sent the speed signal to the amp. I'd be inclined to try contact cleaner on all the cc connections before trying something hard or expensive.
Scott -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of andrew strasfogel Sent: Monday, October 06, 2008 14:39 To: Mercedes Discussion List Subject: [MBZ] Cruise control mystery, W123 300TD Here I goeagain. My W123 1983 300td cruise control worked fine on our trip to Montpelier, but after we got back it started acting sporadically. For example, the CC switch on the steering column would not engage the cruise but would accelerate the car when pressed upwards. When I released it, the speed would drop back and not engage. I purchased a supposedly good used (not rebuilt) CC amplifier on ebay with a DOA warranty, but after installing it on Saturday and doing a road test I had ZERO CC effect - not even accelerating through use of the switch. I concluded that the unit was even more faulty than the one it replaced, but to make sure, I swapped out the CC servo under the hood for another one off the shelf (supposedly good). The road test yielded identical results. Here's the weird part. I spent a couple hours Sunday spraying oily areas on and under the hood with Simple Green, then scrubbing and spraying with a hose to remove a lot of residual oil from when the PO lost all engine oil through ruptured oil cooler lines. As the paint started to show through all the grime, I also scrubbed the CC servo with Simple Green. Basically, the entire engine compartment got wet, although I didn't do a complete and systematic engine wash. When I drove the car out of the garage, through the alley, and back to its parking palce in front of our house, I tested the CC. Guess what? It now works! WTF cubed. How did water have any effect on the workings of the system? _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
