My 88 in the sig is factory equipped with cruise control. I've never tried to use it until a couple of days ago. I was going down the highway and i pressed on, set accel, and I let off the throttle. Nothing happened. It just kept losing speed. Am I doing it right or does my cruise not work?

 

Is the cruise light coming on on the dash? Check under the hood for bad vacuum lines and the Cruise cable on the throttle body for slack or binding.

 

There is no cruise light on these years of trucks.

2x on vacuum lines and throttle cable from the servo, check them 1st. After that, start checking the brake switch and/or clutch switch(if manual tranny).

There are several good threads on the cruise control diagnostics, just search for them.

 

From Steve83: 1983 Ford Bronco Diagrams picture | SuperMotors.net

The last photo and caption have great troubleshooting info.

 

is there an "ON" button you need to hit first my truck is a 95 and i don't have a light either but i need to push on before i hit set

 

Does your speedometer work? If the speedometer gear / speed sensor isn't working, then the cruise won't work. As others have mentioned, open up your cruise servo and check out the cable inside (the servo is the round thing on the driver side fender, just forward of the brake master cylinder / brake booster); my cruise was broken and the problem for me was that cable.

 

Check the brake switch. Mine was not adjusted right so the cruise always thought my brake pedal was down which disables it.

 

These year trucks are cable driven speedometers. The cruise control vss is inline with the cable at the tailshaft of tranny or in xfercase if 4x4.

One thing could be is the switches in the steering wheel could be munged up and/or the slider contacts(clockspring) bad too.

Here's what took out my cruise control...


The ants got into the servo through that little vent hole. It worked most of the way home then quit on me! I checked the brake switch while gasing up the truck, but no luck till I got home and popped the hood to find that supprize !

 

The cruise control on my 98 wasn't working and I tried everything I read . Nothing worked . I was digging around in a wad of wires that the master cylinder tied into and there was a lot of tape . I unwound it and found a 2 amp inline fuse that was blown. I replaced it and the cruise works fine . Like I said I haven't read anything about this in my searches for no cruise control . I hope this helps somebody .

Bill

 

How long ago did you replace that fuse? The fuse was the dealer recall for the defective/leaking brake switch there on the master. If that fuse was blown, it could indicate the switch is going. This little thing has burnt many-a-truck to the ground (and a few houses with it).

 

Thanks , I might need to unplug it .

 

I just put it in today .

 

Sounds like I need to replace that switch .

 

Take it to Ford, they might give you one if it's the old (recalled) style.

Although when they install the fuse harness, they are supposed to check and see if the switch is the fire hazard model or not... and replace it if so.

 

Thanks for the info .