That's exactly what I thought, amazing. Harry Watkins Newton, MS 86 SDL Silver 85 300D Euro 86 SDL Gold 81 240D manual trans
----- Original Message ----- From: "Jim Cathey" <[EMAIL PROTECTED]> To: "Mercedes Discussion List" <[EMAIL PROTECTED]> Sent: Friday, March 24, 2006 10:52 PM Subject: [MBZ] Vacuum cruise controls > I have learned that the set speed, held as charge on the FET's input > capacitor, is stored as a <I>delta</I> from approximately 60 MPH. > That is, Vcc/2 is the initial output voltage of the error amplifier, > and this is approximately the voltage out of the tachometer circuit at > 60. So if you have a cruise control that always seeks out about 60 > MPH when set it may be that the FET (a BSV81) is shorted, or that the > K2 relay (responsible for setting the speed) is stuck on. > > I think somebody complained about this in their SL, and resoldering > had never fixed his problem. > > -- Jim
