Question about 2007 Volvo S40 2.4i Sedan

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How do you check a bad ground in my headlight socket for my 2007 volvo

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A good way to check for ground continuity is to use a multimeter. If the socket has two wires , one will be positive + 12 volts DC or so. The other wire and connector in the socket will be the ground. Put the multimeter on DC volts, 20 volt range, and place the probes into the socket. If you know which socket wire is positive, place the positive(red) probe in that socket connector, and the black probe into the other connector, which is the ground. When you turn the headlights on, you should get a 12 Volt reading, more or less on the meter. If the meter shows a negative sign or the needle deflects to the left on an analog meter, reverse the probes in the socket. If there is no voltage reading, giggle the wires in the socket to see if the problem is in the socket. Also, keep the positive probe in the socket and make good contact with the black probe on a part of the car body. If the meter shows 12 volts then it shows that the socket is getting current (Voltage), so you know the positive wire is good. You can also check for continuity of the ground wire. Turn off the headlights. Put the meter on the continuity setting. On this setting, when you touch the two probes together you will here a buzzing sound. Place one probe in the ground connector of the socket, and make contact with the other probe on a good ground on the vehicle. It doesn't matter which probe is connected to ground. I there is a good ground, the meter will buzz. If it does not buzz, there is a bad ground betwwen the socket and the vehcile ground.

Posted on May 16, 2014


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