Checking for Short Circuits

Another issue that happens to auto electrical and electronic wires and components after a collision is short circuit. This is very commonly observed by technicians working in collision repair shops.

This usually happens because during a collision, the wires gets pinched or severed. This kind of check is usually done by first setting the multi-meter in the same manner as you would with the continuity check. After that, the test leads of the multi-meter is attached to the opposing ends of the adjoining wires. With regard to the reading, a reading of infinity should be observed on the meter. This is because the wires are insulated. On the other hand, if the reading shows zero, then that means that the wires are shorted to ground or another ground wire.

Again, because of the dangers associated with these kind of diagnostic tests, it should only be conducted by a trained professional and a safe environment like a collision repair shop.

Checking for Continuity

It should be that a circuit remains closed and operational if it has continuity. In fact, a continuity check for electrical and electronic wires and components is recommended in all service manuals. This kind of diagnosis is done in order to see if the electrical circuit is completely closed and has no opens.

Just so you know, the continuity check is generally conducted in the following fashion. First, the range selector is set to the highest resistance range possible. Then the multi-meter test leads are connected to the opposite ends of the electrical or electronic wire or component being tested. Finally, the technician reads the multi-meter. If the reading shows zero, then it means that there’s continuity. Alternatively if it shows infinite reading, then there’s an open circuit. Again, this is not to encourage you to do the test or reading on your own. Instead, this is to give you awareness of how the procedure is done.