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Thread: Cruise control

  1. #1
    Join Date
    Feb 2012
    Location
    Canada,BC,Lower Mainland
    Posts
    8

    Default Cruise control

    hi,
    i have a 1982 chev silverado 4x4, 6.2 of course. it has a cruise control. i have no idea if it works or not and i have the truck in the barn getting some badly needed TLC before i put it back on the road.
    does any one know where i can find any kind of schematic or diagram for the cruise control? i did a brief search on the web but didn't see anything obvious.
    thanks
    mike

  2. #2
    Join Date
    May 2004
    Location
    Cincinnati
    Posts
    27

    Default

    Quote Originally Posted by ngodline12 View Post
    hi,
    i have a 1982 chev silverado 4x4, 6.2 of course. it has a cruise control. i have no idea if it works or not and i have the truck in the barn getting some badly needed TLC before i put it back on the road.
    does any one know where i can find any kind of schematic or diagram for the cruise control? i did a brief search on the web but didn't see anything obvious.
    thanks
    mike
    I have 73-80, 83, & 85-91 GM CKRV wiring manuals. I also have CruseMaster, CruseMaster II, & Cruise III training manuals.

    82 is a transition year. It could have Mechanical CruiseMaster, CruiseMaster II (with Resume) or Electronic Cruise III.

    Both of the CruiseMaster systems are VERY simple to troubleshoot and repair. The most common failure points are the brake/clutch switches and the turn-signal stalk switch. The transducer is a mechanical governor similar to a steam engine governor that varies vacuum to the throttle servo.

    CruiseMaster will have a transducer with one electrical connection on the inner fender in the middle of the speedometer cable and a single button activation switch on the turn-signal switch.

    CruiseMaster II will have 2 electrical connections on the transducer and a resume switch on the turn-signal stalk.

    Cruise III is vacuum with embryonic electronics. It has no chunky mechanical transducer on the inner fender there's an optical pickup on the back of the speedometer cluster. The servo has a vacuum connection and a square electric plug.

  3. #3
    Join Date
    Apr 2008
    Location
    Seattle
    Posts
    72

    Default

    Does the optical pickup look like a really big vacuum tube? Becuase I'm pretty sure I have the Cruise III you described and I have a big tube that goes from the unit to the back of the instrument cluster.

    I'm trying to diagnose why mine is failing. It just can't hold cruise for long and then once it goes it is pretty much gone for the rest of the trip odd that it kind of works once per trip. An ideas? Common modes of failure for the Cruise III?
    Ride is a 1991 GMC Suburban with 6.2
    Rojo Grande
    1991 GMC Suburban V2500ish
    every option included, every option broken
    265K on the 3rd, yes 3rd motor
    6.5 block/heads, 6.2 plumbing
    Banks Turbo, 4" exhaust
    33" BFG-MT on black wheels
    3/4 ton axle swap

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