Diagnose dead headlights with our step-by-step troubleshooting guide. Learn to check fuses, bulbs, relays, and wiring—plus upgrade tips for reliable LED replacements.

Testing With a Multimeter If you don’t have the required tools above, you can also test your ignition coils with a multimeter. Check the resistance on both the primary and secondary circuits.

For all of you who have a multimeter thrown in a drawer or toolbox but don’t know how to use it, these instructions will help in your search for missing voltage.

When your car doesn’t start, often the battery is the culprit. Unfortunately, most vehicle owners do not check their battery until it fails. As preventative maintenance, the suggested best practice is ...

Automotive circuits will use either, depending on the circuit. To test the battery, you’ll want to use the DC voltage setting. This will be illustrated by a ’V’ with a straight line beneath it.

Testing that you’ve gotten it right: Now that you’ve found the electromagnet contacts 86 and 85, and thus know that the two remaining ones are 30 and 87, you can actually test the relay as follows.

Over the years, the multimeter has been the most commonly used device to test the amperage and the voltage of solar panels. This does not mean that you can try your solar panels if you don’t have a ...