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Idle Solenoid?

Discussion in '40- & 55-Series Tech' started by xumFJ40, Mar 19, 2004.

  1. xumFJ40

    xumFJ40

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    I am trying to determine if my idle solenoid is working or not.

    How do you test the actual solenoid? If I put a multi-meter between the wire that connects to the idle solenoid and the negative terminal of the battery should I get 12V with the key on?

    As it stands I get .3V when I do this, so I am thinking that it is another problem....any advice?

    Thanks,
     
  2. jwest

    jwest

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    With key on engine off, if you disconnect the solenoid, you should hear it click off.
     
  3. Pin_Head

    Pin_Head

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    The function test of listening for it clicking is a good indication of correct operation, but 0.3 V at the connection can't be good. Either there is a high impedance connection upstream of the solenoid or the solenoid is shorted.
     
  4. xumFJ40

    xumFJ40

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    Pin_head,

    Ok, I know that this sounds weird, but the truck idles. However, I don't hear the click, and as I stated before the voltage is .3 between the lead that connects to the solenoid w/the neg of the multi-meter attached to the neg term of the bat....

    I adjusted some idle settings on the carb this weekend.

    I guess if it runs I shouldn't worry about it...
     
  5. Pin_Head

    Pin_Head

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    If it ain't broke, don't fix it.

    .3 V is strange because of the voltage drop across two resistors in series. The resistance of the solenoid is about 25 ohms, while the wire leading to it should be less than 1 ohm. It should read about 12V. Either the solenoid resistance is too low (shorted) or the resistance of the fed circuit is too high (bad/corroded connection).
     
  6. Rocky_LC

    Rocky_LC

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    If your PO was anything like mine, every wire on your truck should have a crappy splice in it.

    If you can easily access the wire, you should be able to jumper +12V from the battery direct to the solenoid, and hear it "click" to test the function.

    I wouldn't cut into a good wire for this test, though.

    I can't believe the problem is in the solenoid, since a short on 12V would pull alot of current.

    I looked at my wiring diagram, but couldn't tell if that curcuit is fused (it should be).

    Rocky