If you suspect that there may be a short circuit in your car, there are a few things you can do to check. First, use a voltmeter to test the voltage at each of the car's electrical terminals. If the voltage is significantly lower than normal, this could indicate a short circuit. Another way to check for a short circuit is to use an ammeter to measure the current flowing through the car's electrical system. If the current is abnormally high, this could also be an indication of a short circuit. Finally, you can also listen for telltale signs of a short circuit such as sparks or crackling noises coming from the car's electrical system. If you notice any of these symptoms, it's important to have your car checked by a qualified mechanic as soon as possible to avoid further damage.