cruise control adjustment

The vacuum switch over the brake pedal vents vacuum and that releases the cruse control servo. To adjust the vacuum switch, you twist and turn the swich housing and it moves in the mount. The sides of the switch are threaded so it moves when you turn it.

Check the fuse if your cigarette lighter doesn't work: the cruse control runs off the same fuse.

Diagram courtesy of Tmoss & Stang&2birds


See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring http://www.veryuseful.com/mustang/tech/engine/ Everyone should bookmark this site.

Ignition switch wiring
http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif

Fuel, alternator, A/C and ignition wiring
http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

Complete computer, actuator & sensor wiring diagram for 88-91 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

Vacuum diagram 89-93 Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg

HVAC vacuum diagram
http://www.veryuseful.com/mustang/tech/engine/images/Mustang_AC_heat_vacuum_controls.gif

TFI module differences & pinout
http://www.veryuseful.com/mustang/tech/engine/images/TFI_5.0_comparison.gif

Fuse box layout
http://www.veryuseful.com/mustang/tech/engine/images/MustangFuseBox.gif

Put your hand up there, grab it, and pull it in the direction you need it to move. The housing has ridges that will sound like a zip tie when you move it. The ridges hold it in place where you need it to be. If I remember right, you want the button pressed in completely when your foot is OFF the pedal. I had the same problem after switching out my booster.

This happened to me after I did my brake booster too. Cruise stopped working, sure enough the yellow plunger was sticking out with the brake pedal all the way out, AND the vacuum fitting was just barely in the bracket. Super easy to see and shove back in place. I just used a pair of large needlenose pliers to grip the fitting and shove it towards the brake pedal until it stopped. Cruise immediately started working again. Thanks @Red9250!