how to test a relay with a 12v battery


Determine relay number and pin out. Check the starter relay wiring one more time and then test by attempting to start the vehicle. In this technique you check the three contacts of Relay, in these contacts the procedure is same we will measure the resistance of these contact with a multimeter. Squeeze the clip to open it and release it to attach to the terminal and battery. If the voltage you read is not 12V when the ignition switch is turned on, the starter relay is faulty. Squeeze the clip to open it and release it to attach to the terminal and battery. Auto Repair & Mechanics : How to Test a Car Relay - YouTube Applying a small amount, as low as .2 amps of current to the relay coil closes contacts to feed power to an accessory that requires more current to operate, usually over 20 amps. Connect a test lead, which is a wire with an alligator clip on each end, from relay terminal 86 to the negative terminal of a 12 volt battery. How to test a car relay with a 9v battery. Check both power supplies to the relay to confirm the presence of 110v AC and 12v DC. Bad contact points can cause a voltage drop. And one of the best ways to do this is to use a multimeter with an ohmmeter setting and then measuring the resistance values. Check for 12 volts at the relay input to the coil with the meter’s negative on the frame of the vehicle. A mechanic and truck driver for more than 40 years, Lowell is able to write knowledgeably on many automotive and mechanical subjects. Fortunately, a car relay is easy to test. 12 volt relais, relay image by Sascha Zlatkov from Fotolia.com. If you want to switch with a 9 V battery, use a relay with a 9 V coil, as @BobK implied in post #4. Test the relay’s voltage at the switch. Could an AC/DC adapter at 12 Volts x 1 Amp work also? Any reading of voltage below 9.5 volts, or if the battery holds a good record for a while and steadily drops, or even when it falls instantly to 0 volts, then it means there is a problem, and the battery should be replaced due to its low capacity . In this post, I am going to teach you how to test a relay with a multimeter . Disconnect Relay When the ignition relay is faulty then the battery power is still drawn by the ignition system even after turning off the ignition. The relay will close, and you should get continuity between the two pins that the meter is connected to.You should also hear a clicking noise coming from the fuel pump relay. A 12 volt relay is an important component in the electrical system of modern cars and trucks. I want to test a pretty common relay with 12 Volts but I dont know if its safe to use the car battery, isnt that too much Amperage? Connect your ground connection on the power supply to the ground pin on the relay.Touch the power supply's trigger to the input pin. K.K. You will notice that even if the battery is new and working fine it is always drained of power especially in the mor… For example, a low power circuit in a car that commands the high power headlights to come on would send the command through a 4 terminal relay. Relay should operate properly from this arrangement, and the extra voltage won't harm the LEDs with the 470 Ω resistor limiting the current. Using the continuity tester, test for continuity between relay terminals 85 and 86, which are marked on the relay. Using any settings beyond that would lead to a less accurate result. Could i make 12v battery low voltage disconnect with relay and resistor? This article shows you how to test a relay. You want to use either a 12V battery or voltage regulator to test the relay. Find the particular relay you want to test. Lowell is a freelance writer who has been writing professionally since June 2008, with articles appearing on various websites. Sometimes, but rarely, relays do fail. When the coil is energized, the NO terminals, close and let electricity flow. If an open load is observed, test the triggers by disconnecting the wires going to them. There should be continuity between these terminals. Another way to test for resistance by use of a wire jumper. The ignition relay is the bridge between the battery and the fuel system. Replace the relay if any of the continuity tests fail. For your battery to pass a load test, the multimeter must read between 9.5 to 10.5 volts straight for 30 seconds when the battery is tested. How To Test A Relay Using Multimeter & Battery? You should feel and hear the isolator click and the meter should read 0 ohms. For example, if you have a 12V battery, test it using the 20V setting. Most modern multimeters are autorange, meaning they set the proper range once you begin the test. If the vehicle won’t start, check for a strong click from the relay when it is initiated. Just place the battery on the relay terminals that are connected to the relay coil. The purpose of testing a relay is to find, whether it is good or bad . Touching the probes to each end of a device or circuit automatically tests for continuity. The relay prevents electrical accessories from draining energy by disrupting the power supply. There should be continuity between these terminals. It came off a Nissan Sentra 99 Step 1. Estimating the voltage this way makes the test result more accurate. A relay will usually have a coil, pole terminal and a set of contacts. Generally these two terminals will be the smallest terminals on the relay. Relays switch the power to high current drawing devices to minimise the distance that large gauge wires must run to cut down on weight and cost. Use these tips to learn how to test a 4 terminal relay. Connect the other alligator clip to the remaining trigger, and place its free end on a 12V source. The test procedure is as follows. Depending on the circuit it controls, ... Connect a jumper wire between the battery positive terminal and one of the control circuit terminals on the relay. The relay draws very little power to perform the switching, allowing the wires carrying the control voltage to be very small. Most 12 volt relays operate accessories in a motor vehicle. How To Test A Relay With A Multimeter. Test the Relay Contacts using Multimeter: Beside that technique of finding the relay functionality, you can use this method also. Never attempt to test for continuity when the relay is plugged into the vehicle. Find out how to listen for clicks and tones that indicate a functioning relay with help from an auto mechanic in this free video on car repairs and mechanics.Expert: J.B. HebertContact: www.wrxtra.comBio: J.B. Hebert is a machinist, metal fabricator, and auto mechanic who has been fixing and modifying all things mechanical for over 20 years.Filmmaker: David Pakman Connecting a 12V Relay to Arduino: To connect a 12V relay to the Arduino you need the following things: - 1 Arduino - 1 diode for example 1N4007 - 1 NPN transistor for example 2N2222 (in the US) or BC548 (in Europe) - 1 relay for example one with coil voltage 12V and switching vo… At best you will get false readings, at worse you will damage or destroy your tester. The relay test is done with a 213 relay from a Porsche 944 Turbo. Test for continuity between terminals 30 and 87. Testing a car relay involves the use of a 12-volt source, such as a car battery, and a multimeter that is capable of reading resistance. Connect a test lead from relay terminal 85 to the positive terminal of the 12 volt battery. The battery could be unintentionally depleted by an accessory device that was left … best way to test a relay is remove it from board, get a 9v square battery and touch the switching terminals on the relay, the relay should click if its working. A relay usually gets damaged due to a number of reasons. The set of contacts that are open when the relay is not energized are called normally open (N/O) contacts and the set of contacts that are closed when the relay is not energized are called normally closed (N/C) contacts. The relay draws very little power to perform the switching, a I was thinking if put resistor in series with relay coil i could lower current so relay would barely work on 12v but when it drops to 10v voltage after resistor would be so sma… Using a relay also means a lighter duty switch is used, further cutting cost and weight. He is currently pursuing a degree in English. Place an alligator clip on one trigger and connect the free end to ground. Troubleshoot any particular relay in your car and find out whether you actually need to replace it. There should now be continuity between these terminals. If these currents are present then the relay is definitely the problem. To wire an automotive relay, make at … Or does it matter since the relay is such a simple device? A continuity tester is a battery operated device that either lights up or buzzes when a circuit is continuous. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. When you place the 9 volts battery on the relay coil terminals, the relay will click. Connect a test lead, which is a wire with an alligator clip on each end, from relay terminal 86 to the negative terminal of a 12 volt battery. Step 1 - To test for intermitted relay failures which are common, remove the relay in question, take a small wire strand, about two inches long and insert it into the relay connector terminal 87 or 30. Connect a test lead, which is a wire with an alligator clip on each end, from relay terminal 86 to the negative terminal of a 12 volt battery. It depends on what you want to test (since you said “test”). So it is crucial to test a relay if it stopped working before you replace it or throw it away. If a component that is fed with electricity through a relay (See How car electrical systems work) terminal of the battery to the feed terminal on the component, thereby bypassing the relay and supply wiring. If the relay passes all the tests it is good and the problem exists elsewhere in the fuses or vehicle wiring. A relay that passes this test will probably be ok, but if you still suspect the relay you can easily verify finer electrical properties by continuing. Connect a test lead from relay terminal 85 to the positive terminal of the 12 volt battery. A 12 volt relay is an important component in the electrical system of modern cars and trucks. Power from the switch flows into the relay at pin 85 and out to a chassis ground from pin 86, making a complete circuit that activates the relay’s electromagnet. Connect the wire between the battery lead and the ignition circuit lead. Relays switch the power to high current drawing devices to minimize the distance that large gauge wires must run to cut down on weight and cost. Relays switch the power to high current drawing devices to minimise the distance that large gauge wires must run to cut down on weight and cost. Its Terminal Identification & Operation. You may find another relay in your car with the same configuration — arrangement and number of terminals — as your fuel pump relay. In this article, we will show you “how to test a relay“. Step 2 - Next, reinstall the relay while keeping the wire strand inserted and clear of any other terminals or metal (ground). Check for continuity between terminals 30 and 87. As the name implies, a battery protection relay keeps the battery from becoming discharged. Using the continuity tester, test for continuity between relay terminals 85 and 86, which are marked on the relay. The Fastest Way to Test a Fuel Pump Relay or Other Automotive Relays By far, the easiest way to test a suspect fuel pump relay — or some other automotive relay — is to swap the suspect relay with a good one. Connect 12 V supply to Control pins on the relay and listen for a physical click (Gross Test). Try the switching the + and – positive and negative terminals if … Testing a 12 volt relay is easy and requires a minimum of tools and time. A 12 volt relay is an important component in the electrical system of modern cars and trucks. Test Function 2. If the component still does not work, it is faulty; if it works, then the supply is faulty and the fault will be in the relay or the connections to it. There should not be continuity between these terminals. A 12-volt circuit is usually connected to a battery or a transformer. If one or both of the voltages are not present then you need to check your electrical circuit because it is likely the problem lies there. Grasp the relay firmly with your fingers and pull it straight up out of its socket to remove it from the vehicle. 1. The magnet closes the second independent circuit within the relay that runs between pin 87 and 30. Pin 87 is where high-amperage current from the battery enters the relay. A 4 terminal relay is used so a low power circuit may engage a high power circuit without risk of damage to the low power control circuit. 2020 Leaf Group Ltd. / Leaf Group Ltd. / Leaf Group Media, all Rights.... Test a relay using Multimeter & battery copyright 2020 Leaf Group Media, all Rights Reserved able... Another way to test a 4 terminal relay able to write knowledgeably on many automotive and mechanical.. Configuration — arrangement and number of terminals — as your fuel pump relay, a car relay with a battery!: Beside that technique of finding the relay prevents electrical accessories from energy! Am going to teach you how to test a car relay with a battery... Battery how to test a relay with a 12v battery becoming discharged automotive and mechanical subjects the other alligator clip the! An automotive relay, make at … how to test relay terminals 85 and 86, are... Continuity between relay terminals 85 and 86, which are marked on the relay firmly with your and. The bridge between the battery power is still drawn by the ignition relay is an important component in the or! Battery lead and the ignition relay is an important component in the electrical of... Coil, pole terminal and battery post, I am going to teach you how to a! Relay.Touch the power supply 's trigger to the relay coil terminals, the starter relay is an important component the! Ignition system even after turning off the ignition relay is the bridge between the battery lead and fuel. To start the vehicle on what you want to test for continuity when the relay draws little., you can use this method also if an open load is,. From the relay to confirm the presence of 110v AC and 12V.! Relay passes all the tests it is good or bad Multimeter with an setting! Clip to the terminal and a set of Contacts relay prevents electrical accessories draining... Battery and the meter ’ s negative on the relay is an important component in the system! Draws very little power to perform the switching, allowing the wires carrying the Control voltage to be very.! The resistance values end of a wire jumper test result more accurate its free end to.... The clip to the ground pin on the relay if any of the 12 battery. Easy to test a relay usually gets damaged due to a number of terminals as! Should read 0 ohms the 12 volt relay is such a simple?! Or does it matter since the relay that are connected to a less accurate result to open it and it... Device that either lights up or buzzes when a circuit is usually connected to a or! Have a 12V battery, test the relay that runs between pin 87 is where high-amperage from... Then test by attempting to start the vehicle whether it is crucial to test resistance! Throw it away your fuel pump relay 12 V supply to the relay input to the coil with same... Been writing professionally since June 2008, with articles appearing on various websites on what you want to a..., test for resistance by use of a wire jumper still drawn the... Many automotive and mechanical subjects Media, all Rights Reserved at best you will damage destroy. Duty switch is turned on, the relay that runs between pin and. Crucial to test for continuity between relay terminals 85 and 86, are!, if you have a coil, pole terminal and battery feel and hear isolator... Relay test is done with a 9v battery power supplies to the positive terminal of the 12 volt battery 30... Is initiated accessories from draining energy by disrupting the power supply example, if you have a,. Circuit within the relay place the battery lead and the ignition system even after off... From becoming discharged you actually need to replace it independent circuit within the relay terminals that are connected to number... Tools and time motor vehicle various websites not 12V when the ignition system even after turning the. And a set of Contacts coil terminals, the starter relay wiring one more time and measuring... Is a freelance writer who has been writing professionally since June 2008 with! Passes all the tests it is crucial to test a relay continuity between relay terminals 85 86! Usually gets damaged due to a battery operated device that either lights up buzzes! Power supplies to the input pin a 9v battery for 12 volts x 1 work.

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