What does 86 do on a relay?
Realizing that 85 and 86 are the coil pins, these pins will be transferring the current through the coil. 85 will be used to ground your relay, while 86 will be connected to the switchable power. 87 and 87a will be connected to your controlled accessories that you wish to turn on and off with your relay.
What is pin 86 on a relay?
85 and 86 are the coil pins while 30, 87, and 87a are the switch pins. If the coil is not activated, 30 will always be connected to 87a. Think of this as the relay in the Normally Closed (OFF) position. When current is applied to the coil, 30 is then connected to pin 87.
Can a relay cause a short?
Relay Safety The wrong relay can cause a short or a power surge that can damage your vehicle’s electrical system. If the relay is damaged internally, it can cause burning or melting of wiring. Also avoid modifying the relay in any way.
What are the pins on a car 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. Think of this as the relay in the Normally Closed (OFF) position.
What happens when you touch 86 and 85 on a relay?
When you touch 86 and 85 to the battery, the electromagnet pulls the switch contacts together, so the resistance between 30 and 87 should read essentially zero (under one ohm). If it doesn’t, the relay isn’t working.
What are the pins on an ISO micro relay?
An ISO micro relay has the control circuit connected to pin 86 and pin 85, and the load circuit connected to pin 30 and pin 87 or 87a. There will be only 1 second load pin, 87 or 87a, not both.
How many pins does a four terminal relay have?
The relay will have 4 pins; 2 will connect to the control circuit and 2 will connect to the high power load. Identify the relay as an ISO mini type. The International Standards Organization (ISO) defines this type of relay as 1 inch (2.5 cm) square (25.4 mm square).