Introduction to the starting relay
The starter relay is part of the whole vehicle circuit for the engine and battery to work together. If the key were turned to the ON state, the electromagnet would be energized to get its sealing blade pin back to its closed state. Electrical current would flow through a blade pin into the relay coil to initiate the switching action fully to close the circuit to ensure the engine would normally start up.
Starting relay testing method
1. Multimeter test method
Using a multimeter test is the most common method for detecting starting relays. First of all, insert the red test pen of the multimeter into the terminal of the relay coil, then ground the black test pen, open the vehicle door, which can be done. It includes the instant sound of the exit light turning off, which may be heard to identify whether the relay is operating effectively. If you do not hear the sound of the car lights coming on, then you have to replace the relay
2. Testing using a voltmeter
Testing using a voltmeter is also one of the usual methods, and it will offer convenience and quick identification of whether the relays are operating correctly or not. Insert the red test probe of the voltmeter into the relay coil positive terminal, then ground the black test probe. Next, turn the key to the ON position. If the voltage reading from this test is near 12 volts, the relay is good; otherwise, it needs to be replaced.
3. Testing using an oscilloscope
Compared with the above method, testing by oscilloscope is more advanced test method, in which two probes of oscilloscope are to be connected to two terminals of relay coil. Then observe waveform change on oscilloscope. If waveform changes are normal, then the relay is working well; otherwise, the relay must be replaced.
Solutions for some common problems
What shall I do if the starting relay can't work properly?
A short circuit or open circuit in the circuit can make the poor operation of the starting relay, so whether the relevant circuit is normal should be checked and repair timely.
What to do if the contact of starting relay is not good?
Poor contact of a circuit connection can also lead to poor contact of the starting relay. To repair, the cover of the relay needs to be opened, and the coil taken out and welded, or have its contact piece replaced.
In short, starting relays can be tested through various methods, among which multimeters, voltmeters, and oscilloscopes are common testing instruments. Once relevant issues are discovered, the circuit must be checked and repaired in a timely manner. If you want to purchase starter relays, you can choose QIANJI. We will provide you with a solution and also offer samples for testing.
label:how to test starter relay,Test the starter relay,Starter relay