You want to see 50 to ohms. If the multimeter reads Open or Out of Range, it could mean a defective coil winding. In this case, you need a replacement relay. If everything looks good, you can connect the leads between the switch pins.
An open relay will show OL or Open. Next, you want to energize the relay with a volt battery. You should hear a clicking sound when the relay coil closes the connection. Polarity is vital with diode relays, but not 4-pin relays.
Connect your test light across the ground and the switch terminal. Your test light will read the current, causing it to light up if everything is working as it should.
When you remove the jumper, the light should go off. If everything is operating as it should, you want to move onto the switch. A bad contact point can lead to voltage dropping or no voltage at all. Take off the test light and set your multimeter to read DC. Connect the leads on the switch pins. Next, test the resistance of the switch. You need to disconnect the jumper and energize the relay.
The multimeter should be set for ohms, measuring resistance of the switch. The energized open relay will measure nearly 0 ohms, while the closed relay will be OL or Open. If you are unable to diagnose the relay after these steps, you might need further help from a professional.
Relays are found in every modern vehicle. The test program is written by the custom-made software requirements. It can set the number of steps and the number of cycles of relay current load.
It can set the load voltage of relay and relay channel switch, and adjust the time of the test sequence. The interface is as follows:. Figure 8. Interface for test software. When there is an abnormality in the test, the program will immediately stop the test and indicate the status of the abnormality, show the abnormality of the relay, and reveal whether the abnormal state is permanent open circuit or permanent short circuit.
Figure 9. The second relay is abnormal: permanent short circuit. Figure The third relay is abnormal: permanent open circuit. The test software also provides a special function.
When the abnormal relay is replaced with a normal relay, the program can continue to perform the test. The replaced relay test data will be re-counted, and the test data of the relay not being replaced will continue to accumulate. This function can be implemented through Chan and Resume in the program. The test equipment for the entire system is shown on the table below. Different required test specifications can be fulfilled by changing equipment models.
Relay components are common components of many modern mechanical or electronic devices. The life cycle, characteristics, and stability of components are evaluation indices of product quality, therefore, it is necessary to test relay components.
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Things You'll Need. Related Articles. Article Summary. Method 1. Consult the relay schematic or data sheet. Relays have fairly standard pin configurations, but it is best to search for the data sheets to find out more about the number of pins from the manufacturer, if available. Typically, these will be printed on the relay.
Testing pins randomly without knowing the pin configuration is possible, but if the relay is damaged, results may be unpredictable. Some relays, depending on their size, may also have this information printed directly on the body of the relay as well.
Do a basic visual inspection of the relay. Many relays have a clear plastic shell containing the coil and contacts. Visible damage melting, blackening, etc will help narrow down the issue. If that light is off and you've got control voltage to the relay or coil terminals typically A1[line] and A2 [common] then you can safely assume that relay is bad.
Disconnect the power source. Any electrical work should be done with all power sources disconnected, including batteries and line voltage. Do not short capacitor terminals to discharge. Extra low voltage work typically will not fall under this requirement, but it's still important to be safe.
Method 2. Determine the coil requirements of the relay. The manufacturer's part number should be listed on the case of the relay. Look up the applicable data sheet and determine the voltage and current requirements of the control coil.
This also may be printed on the case of larger relays. Find out if the control coil is diode protected. It is very commonly used in motorbikes and cars to drive the ignition. Home Automation Systems installs a large number of relays to control various home appliances remotely and through chips. When the current through electromagnetic coil flows it acts as a temporary magnet and attracts the movable coil which changes the circuit arrangement and this change is utilized to work as required.
Therefore when we supply power to a coil it closes the circuit and If we retract the power to the coil, then the circuit loses its connection with the terminal.
Therefore, the circuit is opened. Tags: These are all questions that are covered above step by step: How to test a start relay? How to test the relay switch? How to test the relay with test light?
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