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DC to AC Power Inverter

Discussion in 'Electronic Basics' started by [email protected], Apr 11, 2006.

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  1. Guest

    Hi,
    I just purchased a 300W power converter. It must be plugged in the
    cigerette plug thing. However I must connect the inverters ground
    connection to either the positive or negative connecter depending on
    whether the car has positive or negative chassis connection.

    My question is: How do I determine whether the cas has positive or
    negative chassis connection?

    Could I simple meassue the voltage difference between the chassis and
    the + on the car battery. If its zero the car has a possitive chassis
    connection. If its +12 or -12 depending on the polarity the chassis is
    connection to the black connecter on the battery.
     
  2. Ban

    Ban Guest

    Open the hood and look which pole of the battery is connected to the
    chassis. I bet it is the negative one.
     
  3. Have a look at your battery. One side - usually minus in European cars - has
    been firmly connected to the chassis with a short, thick cable.

    petrus bitbyter
     
  4. Chris

    Chris Guest

    Almost all cars except real antiques have negative ground.

    1) Call a dealer, and ask somebody from the service department.

    2) Get a digital voltmeter and pop the hood (motor off, please --
    let's be safe). Connect the black lead to an unpainted piece of metal,
    and then touch the battery posts with the red lead. You should read
    +12V on your DVM when you touch the + terminal with the red lead. That
    would mean negative ground. If you read close to 0V, try touching the
    negative terminal. If you read -12V when the red lead touches the -
    terminal, then you have a positive ground. If you don't get a reading
    on either measurement, your first probe isn't touching a piece of metal
    electrically connected to the chassis. Try another piece of metal, and
    repeat.

    3) Post again to s.e.b. and mention the make and model of car.

    Chris
     
  5. Guest

    Its on the negative. Its a Ford Mondeo 2.0TDCi

    Thank you guys..

    /Anders
     
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