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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Cruise control?

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Old Jan 30, 2017 | 07:20 AM
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Cruise control?

I was wondering if the cruise control on my 85 F150 Xl lariat is vacuum powered or electrical? I currently does not work... Any ideas?
 
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Old Jan 30, 2017 | 09:00 AM
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Does your horn button on the pad work?
 
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Old Jan 30, 2017 | 11:55 AM
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A little bit of evrything, electical & vac.


hardy
 
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Old Jan 30, 2017 | 12:46 PM
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s is mainly vacuum. Without it, it will not operate. You should see the mechanism on the drivers side near the firewall. Check the lines there first. Then, there should be a vacuum dump attached to the break pedal. Check that this line is not leaking at all. If both are good, then it is time to check for power. Under the dash to the right of your leg, you will see the computer for it. Two screws hold it in place. Check connections and clean them. After that, I am at a loss. Possible problem with on/off button in steering wheel, etc.
 
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Old Jan 30, 2017 | 11:05 PM
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A common failure is the chain connecting the servo (actuator) cable to the carb linkage. It's that light-duty beaded chain stuff like you see on a ceiling fan or antique light fixture. If that breaks, the speed control won't work.

 
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Old Jan 31, 2017 | 07:48 PM
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The EVTM has a good troubleshooting guide. This is for an '86, but your '85 should be very similar:

Speed Control - ???Gary's Garagemahal
 
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