What happens when a switch is opened on a relay?
This current flow creates a magnetic field around the coil. The top of the coil is positive, and the bottom is negative. When the switch is opened (shown on right), current stops flowing through the control circuit coil, and the magnetic field surrounding the coil cannot be maintained.
Why is the trigger circuit on my relay not working?
If so the trigger circuit of the relay electrical system is working, if not continue to next step. ( Note: If the relay clicks and the circuit is still not working there is a good chance the contacts inside the relay have shorted.)
What should I test for a relay problem?
These accessories can range from the main computer PCM (powertrian control module), radiator fan, fuel pump, door locks etc. There are two tests that should be considered when dealing with a relay problem, is the problem with the relay itself or is the problem a power or ground issue.
What are the basic principles of a relay?
RELAY OPERATION All relays operate using the same basic principle. Our example will use a commonly used 4 – pin relay. Relays have two circuits: A control circuit (shown in GREEN) and a load circuit (shown in RED). The control circuit has a small control coil while the load circuit has a switch. The coil controls the operation of the switch.
What does it mean when a relay does not click?
If you hear or feel the relay click, the relay and its wiring aren’t the problem. But if it’s not clicking, the problem could be in the relay itself or in the wiring.
What happens when a relay switch is closed?
The operation of a Normally Closed relay is the same to that of a Normally Open relay, except backwards. In other words, when the relay control coil is NOT energized, the relay switch contacts are closed, completing the circuit through pins 2 and 4.
What happens when the starter relay is stuck?
If the starter stays on after the engine has ignited, the main contacts in the starter relay have most likely welded together in the closed position. When this occurs, the starter relay will be stuck in the on position and damage will occur to the starter, circuit, relay, and the transmission flywheel if it is not addressed immediately.
RELAY OPERATION All relays operate using the same basic principle. Our example will use a commonly used 4 – pin relay. Relays have two circuits: A control circuit (shown in GREEN) and a load circuit (shown in RED). The control circuit has a small control coil while the load circuit has a switch. The coil controls the operation of the switch.