12v

Discussion in 'Technical' started by joee, Jan 25, 2015.

  1. joee

    joee Member

    Joined:
    Oct 18, 2014
    Messages:
    39
    Likes Received:
    0
    Trophy Points:
    7
    Vehicle:
    70 maverick
    do I need 12 v from the ign. switch to the small terminal on the solenoid?.......the wire I'm using reads 5.5v and all it does is click the starter.....I'm positive the starter is good and it's a new solenoid on the fender apron.
     
  2. Mavaholic

    Mavaholic Growing older but not up!

    Joined:
    Mar 9, 2002
    Messages:
    14,990
    Likes Received:
    209
    Trophy Points:
    258
    Location:
    Live Oak, FL
    Vehicle:
    Original 72 Sprint Owner, 71 Comet GT, 57 Ranchwagon, 57 4 dr Wagon
    Yes you need 12v to the small terminal next to the battery cable terminal on the solenoid to energize it. You can always take a screwdriver and short the battery terminal and the small terminal together. If it cranks, the solenoid, starter and battery are good.
     
  3. schroensr

    schroensr knight Runner

    Joined:
    Mar 7, 2010
    Messages:
    1,147
    Likes Received:
    52
    Trophy Points:
    147
    Garage:
    2
    Location:
    Berkeley Springs,WV 25411
    Vehicle:
    1975 Mercury Comet
    Some models use both switch an ignition terminal s on the solenoid .
     
  4. Mavaholic

    Mavaholic Growing older but not up!

    Joined:
    Mar 9, 2002
    Messages:
    14,990
    Likes Received:
    209
    Trophy Points:
    258
    Location:
    Live Oak, FL
    Vehicle:
    Original 72 Sprint Owner, 71 Comet GT, 57 Ranchwagon, 57 4 dr Wagon
    The second small terminal on the solenoid goes to the ignition system. It supplies 12v out while cranking to bypass the resistive wire going to the coil. Gives you a hotter spark for starting.
     
  5. joee

    joee Member

    Joined:
    Oct 18, 2014
    Messages:
    39
    Likes Received:
    0
    Trophy Points:
    7
    Vehicle:
    70 maverick
    thanks
     
  6. joee

    joee Member

    Joined:
    Oct 18, 2014
    Messages:
    39
    Likes Received:
    0
    Trophy Points:
    7
    Vehicle:
    70 maverick
    hummm......doesn't crank jumping the solenoid.......I'm positive the battery and starter are good and the solenoid is new....it will crank if I run a hot wire from battery to starter side of solenoid and jumping both big terminals on the solenoid.....
     
  7. Krazy Comet

    Krazy Comet Tom

    Joined:
    Sep 13, 2012
    Messages:
    7,709
    Likes Received:
    2,429
    Trophy Points:
    531
    Garage:
    1
    Location:
    Chesapeake VA
    Vehicle:
    1972 Comet GT clone 306 . 1969 Fairlane Cobra 428CJ 1988 T-Bird awaiting 331 ..
    Sounds like you have a battery or maybe cable issue...

    Measure voltage on battery, if it's not 12v there's your problem...
     
  8. Mavaholic

    Mavaholic Growing older but not up!

    Joined:
    Mar 9, 2002
    Messages:
    14,990
    Likes Received:
    209
    Trophy Points:
    258
    Location:
    Live Oak, FL
    Vehicle:
    Original 72 Sprint Owner, 71 Comet GT, 57 Ranchwagon, 57 4 dr Wagon
    First of all make sure the solenoid is properly grounded. It will not work without a ground.
    Then make sure the 2 wires on the small terminals are not switched.
    By jumping together both big terminals on the solenoid, your doing what the solenoid is supposed to do. When 12v is applier to the small "S" start terminal, next to the battery terminal, the solenoid shorts the big terminals, and the small "I" terminal together, so the starter is getting 12v directly from the battery and a full 12 volts is going to the coil. Also make sure the small "S" terminal is next to the battery terminal. If you take a set of jumper cables and jump from the battery terminal to the starter terminal and it cranks, the starter is good and the battery has enough voltage to crank it. Then remove wire from the small "S" terminal and short that terminal to the battery terminal. If nothing happens, the solenoid is bad. After you determine the solenoid is good, you need 12v from the ignition switch to operate the solenoid.
     
  9. joee

    joee Member

    Joined:
    Oct 18, 2014
    Messages:
    39
    Likes Received:
    0
    Trophy Points:
    7
    Vehicle:
    70 maverick
    well boys I gotta tell ya.....I feel like a real doodad.....I've been fooling with cars for over 50 years. my no crank problem was because I had one of the small terminal wires wrong !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! all the replies got me thinking and checking....and mavaholic pretty much nailed it..........good lesson for all........basic ,look for basic stuff !!!!!!!!
    THANKS !!!!!!!!!!!!!!!
     
  10. schroensr

    schroensr knight Runner

    Joined:
    Mar 7, 2010
    Messages:
    1,147
    Likes Received:
    52
    Trophy Points:
    147
    Garage:
    2
    Location:
    Berkeley Springs,WV 25411
    Vehicle:
    1975 Mercury Comet
    We are glad to hear you fixed it. We all over look the obvious sometimes in our lives. Lol
     

Share This Page