How to test a relay in your car?
Step 1: You should use a test light and check the fuses in your vehicle before you proceed with checking the relays just in case the problem is with a few rather than the relay burning it. Every electrical component will have a fuse in the system as well that you can check and replace if necessary.
How do you test for intermitted relay failure?
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. Step 2 – Next, reinstall the relay while keeping the wire strand inserted and clear of any other terminals or metal (ground).
How much does it cost to test a relay?
The most expensive part of testing and replacing relays in your vehicle is the relay itself. Depending on what it’s controlling a relay can cost anywhere from $5 to several hundred dollars.
How can you tell if a relay switch is faulty?
If the component works, the original relay is faulty. If the component still does not work, check the terminals in the base of the relay connector block with the circuit tester probe. For the tester bulb to light there must be a good contact at the test points.
How do you check a relay switch in a car?
Check that a supply wire has not become detached from a terminal. Check each terminal for corrosion, especially the thin wire from one terminal which goes to earth on the car body — probably fastened under a screw or bolt near by.
Do you need to test a relay before replacing it?
Defective Relay. Testing automotive relays before replacing them is a good idea and it’s not to difficult. In most cases if you miss diagnose the electrical problem and buy a new relay and it doesn’t fix the car, you’re stuck with the part you didn’t need.
What are the pins for the starter relay?
Both the ignition switch (pins 7-8 and 2-1) and starter relay contacts (pins 5-3) must measure a resistance of less than 1 ohm during the “start” function. You might try bridging the neutral safety switch as an experiement also, as if that resistance is too high you’ll get uneven operation of the start function.
What to do if your car relay pulls out of socket?
Most car relays pull out of a socket. Sometimes the relay vibrates out or works loose. Try pulling it out and pushing it back in to fix the problem. On a standard Bosch relay there is also a pin labeled 87a. This is not the pin you want. Make sure it’s labeled 87.