How do you test an ignition switch relay?
Set your multimeter to be on the Ohms scale. Place one probe on the lead on the ignition circuit terminal and the other on the ground lead. The reading should be less than 5 Ohms. If it’s more than that, the starter relay is faulty and needs to be replaced.
How does the ignition relay work on a car?
The ignition relay is basically an electrical device that works as a switch for the power to the ignition system and the fuel system of your vehicle. The ignition relay is activated as soon as your turn on the ignition of your vehicle with the key.
Can a bad ignition switch cause a bad relay?
Ignition relay 2: The bottom right terminal should have voltage when the ignition switch is in the ACC and ON positions, if not, the ignition switch is bad. The upper right terminal should be grounded when the ignition switch is in the ON and Start positions, if not, then the Ignition 3 relay/Sunroof relay could be bad or has a bad ground.
What is the purpose of the ignition switch?
by Michelle Schaefer. The ignition switch in a motor vehicle is the main electrical component used by the operator to start, run and turn off the vehicle. The main purpose of the switch is to allow the operator to safely engage the ignition system and activate the electric starter.
How is the starter wire connected to the ignition switch?
This wire energizes vehicle accessories such as the radio when the ignition switch is turned to the “ACC” position. Connect starter relay wire to the “ST” terminal of the ignition switch. The “ST” terminal only activates when the ignition switch is turned to the “START” position and is a spring-loaded momentary contact.
What are the symptoms of a bad starter relay switch?
One of the prime symptoms of a bad relay is the engine cranking up but not starting. This points towards a problem with the fuel delivery system and it may be that the relay that is the culprit. Erratic functioning of the engine at the start and delay in starting up can be an indication of a faulty relay.
What is a bad starter relay?
A bad starter relay on your Ford vehicle will prevent the necessary electrical power from reaching the starter motor; fail to cut off power; or keep the motor from starting at all. Fortunately, all Ford models have a remote relay near the battery, which makes it easy and convenient for troubleshooting.
What does the ignition fuse do?
A fuse keeps a circuit from passing excess current and destroying whatever’s attached to it or melting the wires and starting a fire. Automotive ignition fuse malfunctions pose a few unique problems, primarily since they’re usually not the only thing on that circuit.