Foxbody Mustang Cruise Control information, location, wiring diagrams

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Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
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Finally got around to using the Rotunda 007-00013 speed control test unit.

Pretty straightforward. Step #1 is to become a contortionist and reach up under the dash to disconnect the cruise amplifier wiring.

I ended up using a thin screwdriver to gently pry the retaining latch out, while pulling downward.

You can see the yellow cruise module here and the unplugged connectors.

AD5046CD-E467-4570-A33C-6640154268BA.jpeg


Plug them into the rotunda module
533D26CD-F8A6-467A-8F1D-4BDDBD0C61E7.jpeg


The test is designed to run with the engine running. I didn’t want to do this so I used a vacuum pump. I hooked the vac pump up to the vac tree and that gave the servo enough vacuum to run through the tests. I ran the test with key on. Everything functioned well and it was cool to watch the throttle pedal activate on its own due to the vacuum servo.

One thing that did hang me up. Taillight LEDs. They don’t create enough resistance to properly activate the tester and signal a good circuit. I could only get it to test good one time out of 20-30 tries. I replaced one led with a standard bulb
And that did the trick. May need to add a resistor to the circuit.


Close up of the test unit. I made a video in the next post
7BA3BD5E-F909-470C-A919-825802C7761C.jpeg
 

KRUISR

5 Year Member
Apr 16, 2015
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make sure your steering wheel contacts are free of contamination/corrosion/oxidation. You can unplug the harness at the column and use a multimeter to test continuity by pressing the buttons and seeing if you get the proper values listed above in the diagrams.
Mike, where on the column does that connector attach (the three contact pins that you cleaned)? Is it part of the clock spring or separate on the back of the steering wheel? Oh- on a 1990.
 

Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
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Mike, where on the column does that connector attach (the three contact pins that you cleaned)? Is it part of the clock spring or separate on the back of the steering wheel? Oh- on a 1990.

That pic was specific to an 87-89 car. You can see here with wheel removed.

534FAC23-3730-4164-A3B5-9758D5AE38EC.jpeg


I know the 93 cars have a true clockspring like most modern cars but I think 90-92 are somewhat in the middle. It’s been a while since I’ve pulled the wheel off a 90+ So I forget .


Here’s the plate off a 1990
6A05C3CE-BEB0-47EF-999D-A2FA9FFDAC38.jpeg
 

KRUISR

5 Year Member
Apr 16, 2015
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So you pull the steering wheel off to get at the pins to clean?

Also, I have a spare air bag steering wheel I was told from a 92, it came with a clock spring similar looking to the 93 unit you posted above.
20220606_231551.jpg
 
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Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
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Yes, need to pull the steering wheel off to access them to clean.

I'm not 100% sure on the year breakdown for the clockspring. It's entirely possible that 90-91 is the "hybrid style" such as in post 47 and 92-93 is the true clockspring.
 

DemonGT

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I got my mc machines bracket and re installed the cruise cable. Took the car out last week and it worked. Because of the mods done to the car it makes it annoying though, the car constantly is surging with throttle input.
 

Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
38,680
14,582
224
Massachusetts
I got my mc machines bracket and re installed the cruise cable. Took the car out last week and it worked. Because of the mods done to the car it makes it annoying though, the car constantly is surging with throttle input.


You may want to make sure the cruise control cable is properly adjusted. I believe if there is too much slop, it will cause the cruise to surge up and down.

Pop the cable off the throttle body. On the cruise control part of the cable there is a small clip you can remove to take out some slack. Reinstall the cable and try it again.
 
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