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Old 11-07-2001, 10:54 AM
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Question cruise control and drivers side tail light

What is the relationship between the cruise control and the tail light?
I have a left tail light out and the cruise control activates but continually surges.
Thanks for any help.
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Old 11-07-2001, 12:49 PM
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Join Date: Jun 2000
Location: Tucson, Arizona, USA
Posts: 180
I didn't see what your model was--most likely, the surging and the cutting out is a bad CC amp in your case.

To answer your question, the CC amp receives a ground through the brake lights. Bad bulbs, or in the case of my 190E, a loose screw on the tail-light ground wiring can mess things up.

In the case of my SEC, a bad CC amp was causing the surging. Some have said lubricating the throttle linkage was sufficient to eliminate their surging. Hope that helps . . . Cheers, Andrew Seidel.

Edit: Reference:
Cruise- Should I replace the bulbs even if they are working?
86 560SEC
85 500SEC Lorinser
83 300D Turbo
75 240D

Last edited by 5banger; 11-07-2001 at 01:17 PM.
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Old 11-07-2001, 02:12 PM
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You need to ensure that all your turn signal and brake lamps are metal base lamps, using the brass based American style bulbs will cause problems like this.

Good luck,
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