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95' Dodge No 4wd

Discussion in 'Ram Trucks' started by CAMP Lawncare, Sep 14, 2006.

  1. CAMP Lawncare

    CAMP Lawncare Member
    Messages: 62

    I have a 95' Dodge 1/2 ton the 4wd will not engage the indicator light fails to come on any ideas my thought was possibly the shift motor??????????????
  2. Mick

    Mick PlowSite.com Veteran
    from Maine
    Messages: 5,546

    From the "Dodgeram" site: http://dodgeram.org/tech/repair/4X4/4x4_engagment.htm

    Shift into 4WD and move truck a couple of feet
    If light is still off, park truck, block the wheels, set the park brake, jack right front wheel, and try to hand spin the wheel
    If wheel doesn't turn, 4x4 is functioning properly but there is a wiring problem: use an ohmmeter to check the 4x4 switch, wiring, fuse, and bulb.
    If wheel turns freely, the front axle or transfer case is not engaged: continue...
    Attempt to hand spin the front driveshaft If the driveshaft WILL spin, the transfer case is not engaged Check the transfer case shift linkage, problem is in linkage (or in the tran$fer ca$e internal$ <-- yes this means $$, ouch!)
    If the driveshaft will NOT spin, the transfer case is engaged properly: continue...
    USE CAUTION! With transmission in neutral or park, start engine, measure vacuum on the two vac lines at front axle shift motor. One line should have approx 20" vacuum, other line should have none.
    If NO vacuum measured, look for vacuum leak or bad vacuum switch.
    If both lines have vacuum, look for a bad vacuum switch or ruptured CAD actuator diaphragm.
    If one line has 20" +/- vacuum:
    Move transfer case lever to 2WD, measure vacuum again. Lines should have swapped vacuum signals.
    If No: vacuum switch bad or 4WD shift linkage needs adjusting
    If Yes: Vacuum motor bad or stuck, or shift fork stuck: continue
    Remove vacuum shift motor from the axle, attach vac lines to shift motor, engage/disengage 4WD. Does shift motor plunger move at least 1/2"?
    No: shift motor bad
    Yes: Check axle shift fork and vacuum motor for binding

    RODHALL Senior Member
    Messages: 374

    Start with CAD vacumm lines, CAD unit, CAD switch on the tansfer case.

    If you would have broken the NP241 transfer case you would know it. same holds true with the front axle.