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Discuss Cig Lighter fuses keep blowing in the Auto Electrician Forum area at ElectrciansForums.co.uk.

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  1. Jordan
    Offline

    Jordan EF Member

    Location:
    Canada
    1991 GMC Sonoma compact pickup

    So i am guessing the previous owner installed an after market lighter socket as it has an inline fuse behind it. The lighter is also connected to a blade fuse in the fuse box. I checked continuity on the lighter and I have a closed circuit. When I got it the online fuse was five amps. I tried a few AGC fuses until they stopped blowing. The blade fuse is supposed to be 20A so I settled with a 20A AGC behind the lighter. But now when I install the glass fuse, the blade fuse in the fuse box blows! What is happening here? I thought this would be simple....
     
  2. mickfred
    Offline

    mickfred Regular EF Member

    Location:
    Liverpool
    Check there is not a screen or paperclip fell down it
     
  3. telectrix
    Offline

    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    what rating is the blade fuse ? 10A is normal for a cig. lighter . also, see if it blows with the lighter part out of socket.
     
  4. Jordan
    Offline

    Jordan EF Member

    Location:
    Canada
    The blade fuse is 20 and that’s also what the manual says to use. The socket is clear of debris and has no lighter to put in it. (I just want to use it to power devices)
     
  5. spinlondon
    Offline

    spinlondon Trusted Advisor

    Location:
    Harlow Essex
    If you have a closed circuit on the lighter, then you have a short circuit.
    Should be open circuit.
     
    • Agree Agree x 1
  6. Jordan
    Offline

    Jordan EF Member

    Location:
    Canada
    Well I mean to say the positive and negative are hooked up nice and clean
     
  7. spinlondon
    Offline

    spinlondon Trusted Advisor

    Location:
    Harlow Essex
    Taking your multimeter, remove the in line fuse and insert one of the probes. Place the other probe in contact with a known ground/earth and check for continuity.
    If there is continuity, there is a short circuit.
    No continuity, there should be no problem.

    I take it that the 20A blade fuse does not blow until the in line glass fuse is inserted?
     
  8. Jordan
    Offline

    Jordan EF Member

    Location:
    Canada
    Great thanks I will try that tonight. And yes, blade fuse blows only when tube fuse is inserted.
     
  9. spinlondon
    Offline

    spinlondon Trusted Advisor

    Location:
    Harlow Essex
    That suggests, the wiring up to the fuse holder is ok.
     
  10. Jordan
    Offline

    Jordan EF Member

    Location:
    Canada
    So would that mean it’s just the socket doing this for some reason? It’s definitely clear of debris
     
  11. telectrix
    Offline

    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    if you check for continuity from the lighter side of the in line fuse holder and the body of the lighter you should get open circuit.if it's a low ohms reading, then the lighter socket is buggered.
     
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