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  1. #1
    Light Load Member
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    FLD120 Cruise Control

    Here's some dumb questions, posed cause maybe someone can steer me to the right functioning and electrical component locations.

    The cruise has never worked since buying the truck and I want to fix it.

    Two lever switches mounted on the underdash area just above my left knee. I assume the left most switch is to enable (up) or disable (down) the cruise feature and the rightmost is to resume cruise/increase speed (up) or set cruise/decrease speed (down). Cruise gets suspended if the clutch or brake is pressed.

    Is this how the FLD is setup. I need to get it working so I can control the idle, especially with the up and coming winter.

    Are most of the electrical components accessible under the center panel? i.e. fuses? relays? etc.

    Thank you for any experience/knowledge furnished.

  2. #2
    Light Load Member
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    I did a search and found some info that says to check the clutch and brake return springs and switches first. Will do.

    Also with the FLD, does it have a light indicator to confirm cruise is engaged?

    Thanks again.

  3. #3
    Light Load Member
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    The cruise switch that toggles up/down momentarily was not working internally.

    Got a replacement, now to install and here's hoping.

  4. #4
    Medium Load Member freightrunner's Avatar
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    What year??

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  6. #5
    Road Train Member Pablo-UA's Avatar
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    I'd check pedal switches too

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  8. #6
    Light Load Member
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    Quote Originally Posted by freightrunner View Post
    What year??
    1989 - thinking the switch layout/function is common. The momentary toggle switch in mine was broken internally, I changed it but still doesn't work for stop idle up or driving.

  9. #7
    Light Load Member
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    Quote Originally Posted by Pablo-UA View Post
    I'd check pedal switches too
    I got diverted with work, but still have to check this one out. Quick glance, those darn switches must be buried in there. Couldn't see them.

  10. #8
    Bobtail Member
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    have you checked your parking brake safety switch ? behind air button inside the dash is a pressure switch that has single wire that likes to fall off connector . i added a longer wire to connector and fixed my high idle ,cruise control problem. hope this helps

  11. #9
    Light Load Member joecitizen's Avatar
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    i have a '93 FLD120 with a non-functioning cruise control. Have you had a chance to solve your issue? I too can not find a wiring schematic to help me trace down the wiring and sensors.