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97 f150 no 4wd

Discussion in 'Truck & Equipment Repair' started by Gman1200hd, Dec 14, 2014.

  1. Gman1200hd

    Gman1200hd Member
    Messages: 35

    hi guys my buddy has a 97 f150 scab 4.6l auto with the electric 4wd as a backup truck but when he pulled out the 4wd won't work there is power at the switch but no 4x4 indicator lights come on and won't lock in does anyone know witch relays control that or have any other suggestions.Thanks in advance
     
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    Ck the motor on the tcase. Common issue.
     
  3. Rick547

    Rick547 Senior Member
    from Indiana
    Messages: 535

    Or a broken vacuum line.
     
  4. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    150s didn't have vacuum hubs
     
  5. Rick547

    Rick547 Senior Member
    from Indiana
    Messages: 535

  6. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    Link didn't work.
     
  7. Rick547

    Rick547 Senior Member
    from Indiana
    Messages: 535

    Thats funny. It worked for me.

    [​IMG]
     
  8. rjigto4oje

    rjigto4oje PlowSite.com Addict
    Messages: 1,295

    Here's another common part that fails

    Screenshot_2014-12-14-18-40-58.jpg
     
  9. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    No, still didn't

    Screenshot_2014-12-14-18-42-05.jpg
     
  10. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    Ok, vacuum parts to operate.
     
  11. Rick547

    Rick547 Senior Member
    from Indiana
    Messages: 535

    The most common failure is the vacuum line to the actuator. How do I know? It happened to me on my 99 Ford F150. Ford wants a fortune for the line though.
     
  12. rjigto4oje

    rjigto4oje PlowSite.com Addict
    Messages: 1,295

    I've replaced quite a few of the switchs on the right fender well like the one i posted
     
  13. Rick547

    Rick547 Senior Member
    from Indiana
    Messages: 535

    I've heard they get brittle and break. Luckily it has not happened to me yet.
     
  14. rjigto4oje

    rjigto4oje PlowSite.com Addict
    Messages: 1,295

    Ive worked on all the big 3 they all have similar issues dodges have rusty lines and 4 wheel drive vacuum actuators gm front diff heater/actuator its a 97 anything is possible you'll fix 1 problem and then have another one good luck
     
  15. Rick547

    Rick547 Senior Member
    from Indiana
    Messages: 535

    That is the reason I'm retiring the 99 F150. It has turned into a rust bucket and just not worth putting money in it any more. Now I have to decide what to do with it and the Snoway 26 plow. I just may keep it as a backup or give it to my grandson.
     
  16. rjigto4oje

    rjigto4oje PlowSite.com Addict
    Messages: 1,295

    Backup is a good choice i have a 96 and a 98 i plow with I do all my own work as a mechanic by trade i recently got the rust fixed did it myself looks fair but i always keep up on whatever it needs
     
  17. nixray

    nixray Senior Member
    Messages: 165

    I recently acquired the same truck as the OP. For a great deal.
    When I select it for 4x4 it clicks three or four times, but never kicks in, If I restart the truck with the switch still in 4x4, it clicks twice and the engages. Same thing for selecting 2x4.
    I know I have to replace something, just havent dug into what yet.
    Hopefully this helps
     
  18. Gman1200hd

    Gman1200hd Member
    Messages: 35

    After doing more research it is pointing to the gem being bad because we have power at the switch but no indicator lightsor sunlight clicking when the switch to turn to 4 wheel drive