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Wiring tests for Cruise control (mechanical 1984) 200

posted by  Jessie on  Fri Sep 13 07:21 CST 2002
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last visit: Tue Jan 18 17:45 CST 2011
[RELATED]

Thanks Art. I have already checked the vacuum switch (actually I read an archived article of yours) I have blown into the hose from the actuator and there is no leakage. I have checked the stalk switches, and I get power from the brake pedal (through the switch) and from fuse #1 at the control unit. I also noticed that the ground comes from the actuator in the engine compartment.
What I don't understand is how the clutch and mercury switch work. If you hit the brake the brake switch sends a 12+ signal through the clutch switch and mercury switch to the control unit to disengage it. But what happens when you push the clutch switch without the brake? There is no 12 volt signal. The wire is connected to the brake wire going to the bulb failure relay so it must be getting a ground signal or something from that. It says something in Haynes about the cruise not working if both brake lights are burnt out. I hope it was not tied into the "ding ding" thing because I turf them out whenever I get a Volvo(the noise drives me crazy).
Anyway everything checks out otherwise. I am going to do some errands so I will see if it is working. I don't know how to check the actuator and the control unit, but I have some spares that I can try swapping in, except I don't know if they work either.





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