Cruise control 94 eddie bauer explorer, 4x4, 4.0, cruise control doesn't work at all???? checked fuses, vacuum lines wires, and connections. all ok???

Question edited for clarity, full year make model
Question moved to sub category.

It appears to have history. A bit worrying you say 'kinda changed the filter and fluid'. Most are sealed for life, and the amount of fluid is critical. If you drain, you measure what comes out and replace with the same amount of the right type of ATF.

You are not alone with issues

https://www.google.com/search?q=1994+Explorer+Eddie+Bauer+4x4+wont+go+into+Drive

Schematics

https://www.google.com/search?q=1994+ford+explorer+eddie+bauer+4x4+transmission+schematics

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Jeff Armer Sep 22, 2021

Has no relay for headlamps , just fuse's , fuse # 12 30 amp under hood fuse / relay box and fuse's 33 , 4 and 8 fuse box inside the vehicle .

Hope this helps.

Interior Fuse Box Location 2006 2010 Ford Explorer 2006 Ford Explorer...

Diagram:

Fuse and relay locations 2nd generation power distribution box Layout

I'm guessing you're referring to the cruise control (speed control module)? I've included a pic to refer to what it looks like. depending on a v6 or v8 engine the location may differ under the hood. The wiring going into the object in the foreground is the module, with the cable on top that goes to the throttle to control speed.

have the CPU program reset using a code reader as jumping produces a surge of power that corrupts the program

The switch itself is probably bad. You can pop the switch out and unplug the wires to verify. You can pull the fuse to deactivate temporarily. The fuse is probably powering other items too, so find out what else is sharing the fuse.

pull that switch from dash board and check the plug. make sure you have no burned or melted wires. maybe just the switch

could the ingress of water have got inside the control box?? or the wiring connections causing them to corrode ?' other than that i have no idea as i havent work on many of this vehicle here in spain.sorry for no instant fixya type answer

since the fuses are ok i would try the servo this is the piece that looks like two face. it has a solid back on one side and a rubber front on the other it should be around your master cylinder. check to make sure that the wires arent frayed or have come loose.

Ok, the '03 Jeep Grand Cherokee uses a small vacuum line to control the servos. Since your light comes on, it's obviously getting power. 9 out of 10 times it's the vacuum hose.
Pop the hood and look on the passenger side towards the back for the engine coolant reservoir. It's most likely underneath it so you may have to remove the res. Check the vacuum hose and all vac. connections then check the electrical connections. If that's not the problem, check the cruise control connection to the throttle linkage.
If that still doesn't do it, you may need use scan tools and diagnostic procedures that are out of the scope of home mechanics.
Wish ya luck!