How do I test a relay with a multimeter?

Grab a multimeter and set it to Ohms. Touch the leads across the electromagnet coil pins and measure resistance. Anywhere from 50-120 ohms is OK. Out of range or open means a bad electromagnet coil winding and time for a new relay.

How do you tell if a relay is bad with a multimeter?

The only tool required to check a relay is a multimeter. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located).

How can you tell if a solenoid is bad?

If the clicking you are hearing is quiet or repetitive, it may be that your solenoid is not strong enough or does not have enough power from the battery. If you hear no sound at all or the car doesn’t start, this could be a sign of a faulty solenoid.

How much resistance should a solenoid have?

For irrigation applications, a solenoid is considered to be good if its resistance is between 20 – 60 ohms. It is best to compare resistance measurements to that of a new solenoid. Example, if a solenoid measures 44 ohms, it would be considered good because it is between 20 – 60 ohms.

Can a bad relay still click?

If your starter relay has gone bad, the electrical signal will never make it from the battery to the starter motor. A faulty relay often produces an audible clicking sound when you turn your car.

What happens if you put a relay in backwards?

Often seen as a quick fix, using the wrong relay for the application can cause inadvertent voltage spikes. Many relays, if installed for the wrong application, could and will cause a short (Internal Relay Circuit) and most likely cause functionality issues or even damage to the vehicle computer systems.

Can you burn out a solenoid?

In rare cases, a solenoid coil will burn out due to OVERVOLTAGE. The plunger WILL close, because the solenoid has extra force. (You’ll find no melted bobbin.) The high voltage causes excessive holding current which will overheat the coil and burn it out.

How do you test the solenoid and relay?

Using a battery, a 9 volt may work, connect battery positive to the passenger side small pin and battery negative to the drivers side small pin. This will activate the relay and you should hear it. Now with power applied, test for continuity between the two large copper pins, Pins 30 n 87.

How to test the continuity of a relay?

To test the relay you need to do a continuity test or an ohm test with a meter. First test is to test for continuity between the two small pins, 85 n 86, on the relay. You should have continuity or read about 70 ohms on a meter. Mine reads 68 ohms. Now do the same test between the 2 larger copper pins, Pins 30 n 87.

How do you test a fuel shut down solenoid?

This is the 3 Pin connector on the fuel shut down solenoid. How to test the solenoid. Use a 12 volt battery. Connect a jumper wire from the black pin to battery negative. Connect a jumper wire from the red pin to battery positive. Now connect a thick wire to battery positive.

What do I need to test a car relay?

Testing a relay is not as complicated as people think. You will need a 12v power supply or car battery and multimeter voltmeter. This will work on most car relays. Some might differ. We even opened one of the relays so we can show you how it functions and what it happens when there is electricity charge.