4 Prong Relay Wiring Diagram

October 23, 2024 Post a Comment

4 prong relay wiring diagram

4 Pin Relay 4 pin relays use 2 pins (85 & 86) to control the coil and 2 pins (30 & 87) which switch power on a single circuit. There are 2 types of 4 pin relay available; normally open or normally closed. A normally open relay will switch power ON for a circuit when the coil is activated.

How is a 4 pin relay wired?

So let's wire the 4-pin up it's super simple it has a wiring diagram right there. So 85 is usually

What is 85 and 86 on a relay?

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.

What do pins 30 and 87 do on a relay?

One of these will be used to ground your current, while the other will be connected to a switched power source. 87 and/or 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.

Can a 4 pin relay be put in backwards?

You'll mangle the pins, and probably damage the socket. All plug-in relays I've seen had a pin layout where it would not fit if you tried to plug it in backwards.

How do you tell which pin is which on a relay?

Every relay has a coin the white one which when energized activates the contacts. So of all the pins

How do I know if my 4 pin relay is working?

And you want to connect one side to 285. And the other side to 86. And you're gonna hear it click to

How do you test a 4 pin relay with a multimeter?

Take the leads of the multimeter and connect them across the coil terminals of the relay. For a normal coil, the multimeter should read anywhere between 40Ω to 120Ω. If the coil is damaged i.e., it is open, the meter shows out of range and you have to replace the relay.

How do you wire a 4 way connector?

The color code for wiring harnesses can vary between manufacturers, but the general standard for 4-way plugs is as follows:

Green: Right turn/brake light.
Yellow: Left turn/brake light.
Brown: Tail/running lights.
White: Ground wire.

What does 87a mean on a relay?

87a. High current (load) Output to other device, normally closed, pulled open when coil is energized.

Is pin 85 or 86 the ground on a relay?

Terminal 86 supplies power to the relay's internal electromagnet. Terminal 85 grounds the electromagnet.

What does pin 87 do on a relay?

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. 30 will then be the pin connected to your battery power.

Can a relay switch from 30 to 87?

Terminals 30 and 87 are electrically equivalent - the circuit will work the same, regardless of which way they are connected. The connection from terminal 87 to 86 goes through the thermal switch, so the switch will control the fan.

What does 85 mean on a relay?

Terminal/Pin number	Connection
85	Coil
86	Coil
87	Normally Open (NO)
87a	Normally Closed (NC) - not present on 4 pin relays

Which relay pin is ground?

The second pin, or ground is the housing which must be mounted direct to chassis or otherwise grounded. If your relay is in a plastic housing it will have 2 pins for the coil, usually reversible.

What happens if you wire a relay wrong?

Many relays, if installed for the wrong application, could and will cause a short (Internal Relay Circuit) and most likely cause functionality issues or even damage to the vehicle computer systems. Just because it has the same number/location of terminals, doesn't mean the relay works for that application.

Does it matter which way a relay is plugged in?

no, most of the time. There's no polarity for a basic relay, and most are specified for both AC and DC.. However… there are polarised relays that use permanent magnets to either assist or to latch the relay.

Why is back up relay necessary?

Protective relays are sometimes used in backup power systems to protect circuits and load equipment from undesirable or potentially damaging electrical conditions and events.

What is the common terminal on a relay?

The COM (Common) connection of a relay is the part of the relay that moves. When a relay is off, the COMMON is connected to the NC (Normally Closed). The NO (Normally Open) connection of the relay is not connected until the relay turns on. When the relay turns on, the COMMON move from NC to NO.