A relay is a component that uses a electromagnetic switch to create contact between wires. There are 2 relays we used. A two switching circuit and a one switching circuit.
These are the terminals and what they do.
86 - positive side of control circuit
85 - negative side of control circuit
30 - battery supply for switched circuit
87 - open circuit when relay is off
87a - Closed when circuit is off
A low amp current goes through 86, through windings around an iron core creating an electro magnet and out terminal 85 to ground.
This electro magnet pulls a pin/switch down onto the contacts 30 and 87 completing the circuit and turning on any components wired to the 87 side side of the relay.
In the off position the relay recieves voltage but doesnt consume any between 86-85 there is no resistance because the relay is not on. there is no voltage in terminal 87 because the contacts are open and cannot recieve any voltage.
When the switch is on the relay is consuming voltage and none is left when it gets to terminal 85. There is now full available voltage at 87 because the switch is closed.
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