I found this information about relays and how to understand how they work. I hope this will help with relay problems and how to know which type you need. I couldn't put the images in here but, this is where to find them,http://www.delcity.net/documents/automotive_relay_diagram.jsp
Looking Inside a Relay
If we were to open a relay, you would see an electromagnet coil, the switch, and a spring. The spring holds the switch in position until a current gets passed through the coil. The coil then generates the magnetic field which moves the switch on and off
Numbers of a Relay
Looking at the diagram, we see the pinout of a typical 12V relay. Note that each pin is numbered. 85 and 86 are the coil pins while 30, 87, and 87a are the switch pins.
87 and 87a are the two contacts to which 30 will connect. If the coil is not activated, 30 will always be connected to 87a. You can think of this as the switch in OFF. When current is applied to the coil, 30 is then connected to pin 87. The great thing about relays is that you can set 87 and 87a to be either open or closed, depending on how you need the switch to work. If you want a closed relay, you will want to wire to 87a. If you want a normally open relay, you will wire to 87.
Although most relays are labeled at the bottom, you can always find the 30 pin set perpendicular to the other pins for easy identification to the power source.
Output for a Relay
Realizing that 85 and 86 are the coil pins, these pins will be transferring the current through their coil. One of these will be used to ground your current, while the other will be connected to an accessory, or your point of current.
87 and 87a will be connected to your controlled accessories that you wish to turn on and off with your relay.
30 will then be the pin connected to your battery power.
Those who say it can't be done should try not to interrupt those who are doing it.
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Charlie1Horse wrote:I found this information about relays and how to understand how they work. I hope this will help with relay problems and how to know which type you need.
Great info, thanks for sharing.
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