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Short Circuits troubleshooting

Discussion in 'Electrical Engineering' started by Cracker Jacks, Nov 23, 2003.

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  1. I am trying to track down a problem in a car. A fuse keeps blowing. It is my
    understanding one way to do this is to remove the fuse and place a test
    buzzer/light in the connections in the fuse spot. With all circuits closed,
    I should have no power going through this fuse location. If I have power
    there is a short is this correct? I understand power is coming from the
    battery to one side of the fuse, but unless there is a "ground" there should
    be no power going through it correct? How does that work exactly. Please
    keep it as simple as possible. Thanks in advance.
     
  2. Dave M.

    Dave M. Guest

    "no power"... You mean "power" when the load is connected.

    If I have power
    If the loads on the circuit branch are disconnected (turned off) and your
    test lamp is lit there is a short curcuit. Some circuits can have continuos
    loads on them, but would be small and not enough to make the lamp glow. The
    resistance of the short or load has to be low or the conductivity high in
    proportion to the test lamp for the lamp to glow. If the lamp and shorts
    resistance values are 50/50 the lamp will glow at about half it's
    brightness. If the short is direct (0 ohms), the lamp will glow at full
    brightness.


    I understand power is coming from the
    The battery is always grounded. The fuse is connected through a buss in the
    fuse box to the battery positive terminal through a main fuse.
     
  3. Tony Hwang

    Tony Hwang Guest

    Hi,
    Buzzer will buzz until you remove the short or you can use small light
    bulb instead of buzzer. Light will go off when short is removed.
    Tony
     
  4. No actually it is a 20a fuse under the hood in the engine compartment. The
    fuse is for Horn, Stop and seat belt retract. It's part of the brake warning
    system. Leads to a brake safety warning sensor (light bulb out ect). The
    brake lights will not work with the fuse removed. The fuse does not blow
    with the left sensor removed, but with the left senor removed, I have no
    left brake light.
     
  5. Our library here is small do you think they would have it? Do you think
    there is a Library online that may have it?
     
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