Muiltimeters or Test Lights? Does It Matter?

I have been to a lot of car audio shops that use test lights, and not as many that use digital multimeters. Is one honestly "better" than the other for looking power sources?

Absolutely! A test light looks like a screwdriver with a sharp pointed end, and consist of a small bulb and a grounding wire or cable. It works by grounding the bulb, and once it comes in contact with a power source, it will complete the circuit and light the bulb. This is the easiest way to test power because the bulb whether lights up for power or doesn't if their isn't any power.

In Dash Double Din

The problem with using this type of testing on todays vehicles is the complexity of some of the circuits inside the dash. When you complete the test light circuit on a "hot" wire, you essentially create a small "arc" of electricity that can short some of the more sensitive tool such as an air bag sensor or relay. I have honestly seen one installer blow the airbags out of a new Bmw M3 by testing wires with a test light. In most cases, it won't cause any harm, but when it does the cost can be very high.

I very propose using a digital multimeter to test circuits. The are very correct and can tell you a lot of beneficial data such as voltage, amps, and ohms, all of which are necessary to know when construction a good sound system.

These multimeters work a diminutive differently than a acceptable test light. They typically have a battery on board to power the meter, so they don't pull power from the power source, reducing the tendencies to "arc" the power source. They are ordinarily safer to use on sensitive systems than their test light counterparts for this reason.

Digital Multimeters are a great tool for car audio installers, as they can help track down problems in the system. They are also a must have when installing any other 12 volt auto accessories. A test light will light up under power, but wont tell you if you are getting the permissible voltage and amps. With a multimeter, you can start at the component taking readings, and work your way backwards until you find the component that is not functioning properly.

Multimeters range from about .00 to over 0.00, and depending on your level of work and how correct you need to be, you can find one that will work for you. They are a great investment, and will save a lot of ill when you are problem solving a system.

Muiltimeters or Test Lights? Does It Matter?