CRUISE CONTROL

[afinney@tamsconsultants.com]

Nobody could answer my question about the cruise control
clutch and brake switches on the earlier 4000 series, so here
goes again. What I'm wondering is why the plunger switches
on the clutch and brake interupt the flow of power to terminal
3 of the control unit. The switches don't even see power until
the brake pedal is depressed and power is sent to the brake
lights. So what is the point of then interupting this flow if it
was only just initiated? Unless the point is to pick up a very
fast flash of voltage that occurs in the split second after the
brake lights are activated and before the cruise control brake
switch interupts it. The reason I ask has to do with the
Bentley manual which says that a test lamp connected
between terminal 1 and 3 should light up when the brake is
depressed. Mine doesn't and I can't see how it ever would if
the cruise control brake switch interupts its power. Any help
is much appreciated.

Andrew Finney.
1983 UrQ