how to test a relay without a multimeter

Wiggies are incredibly rugged and very less susceptible to damage through electrical overload. Find out which terminal belongs coil and load circuit. If you arent sure what you are doing, you could easily create large problems or cause injury. Testing Relays Coil Circuit With a Multimeter, 2. An open relay will show OL or Open. A tester is a multi-function device that will aid in performing most, if not all, electrical testing duties. 18650 batteries are lithium-ion cells that are commonly used in several electronic devices such as laptops, bluetooth speakers, portable consumer electronics and power banks. The positive jumper wire must be disconnected, and the electromagnet coil should be energized. His passion for auto electrics and his ability to solve technical problems quickly and efficiently is what sets him apart. Allow Necessary Cookies & Continue If its bad, the meter will read 0 or OL, but if the relay is good it will read 0.7 for a silicon transistor (which almost all of them are) or 0.5 for a germanium transistor (which are relatively rare but not unheard of). One of the best ways to check a relay is to test the resistance between the ends. Sometimes overheating prevents proper current flow in a circuit. The resistance must be between 50 and 120 ohms for a relay to operate properly. However, like electromechanical devices, relays are subjected to wear and tear and will eventually malfunction at any time. Resistance isn't polarized. % of people told us that this article helped them. The location will depend on what the relay controls. We will test pins 87 and 87a with respect to pin 30. If the ohmmeter checks for resistance on the pins 30 and 87 paths by its abbreviation, OL, which means that Open-Loop or Open Load or with very high resistance. Your vehicle includes a multitude of electrical components, all required to work together in harmony for a seamless experience. This article was co-authored by Ricardo Mitchell. The two run coils should be easy to identify.Generally, you have 3 wires going to the motor for ac. Find a safe location in your garage or workshop to work with the automotive relays. Step 1: Identify the Terminal Pins on the . Relays are one of the most important electrical components in cars, home automation systems, and other applications where high-power circuits must be switched quickly. Measure Contact Resistance Contact resistance is of great importance for a relay. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. These accessories can range from the main computer PCM (powertrian control module), radiator fan, fuel pump, door locks etc. The resistance of the coil circuit is approximately 50 to 120-ohm value between coil circuit pins. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/4\/4f\/Test-a-Relay-Step-2-Version-2.jpg\/v4-460px-Test-a-Relay-Step-2-Version-2.jpg","bigUrl":"\/images\/thumb\/4\/4f\/Test-a-Relay-Step-2-Version-2.jpg\/aid1420038-v4-728px-Test-a-Relay-Step-2-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"