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Basic Automotive Relay Operation and Simple Wiring

Jun 10, 2021
Alright guys, this video is going to be based on

relay

s and

basic

wiring

for lights or speakers,

basic

ally whatever you want to put in your Jeep or car or whatever, this is basically just a

simple

explanation of how to incorporate a

relay

into your

wiring

. which could be good for many reasons that I will explain a little first, let's look at a relay. This is a basic example of a relay. What you will have here are your four poles, of which some of them have five and I will explain to you that in just a second, which would be right in the center, which is 87a, the first one will be your 85, which is your ground, and the 85 and 86 will basically be your trigger circuit now what a relay does is just a bridge to a higher power circuit we've all heard of like a starter solenoid, that's because the starter motor can draw over a hundred amps when you start an engine and if you just flip it your ignition switch would easily fry the wires so use the solenoid and a solenoid is basically a stronger version of this relay and obviously it looks different but it does the same thing, so you have 85 and 80 that will be what tells the switch to close for your larger circuit now usually you will connect your 85 to your ground and your 86 will connect to your power so basically break the supply of the switch so you can connect thinner wires to your dash. of

operation

, you know your 14 gauge wire, you know what you may need for your fixture depending on the amperage you draw, your other tips here, 30 and 87, will be a free or real intellectual fixture, now xxx will be, you know they are labeled here , I'm saying all these numbers but if you look at the relay they are labeled or sometimes I have a diagram like this and xxx will be where your 12 volt supply comes in, normally you'll want to fuse that with something like a 15 amp fuse or you know just below what the relay is capable of supporting and this can apply to fan lights horns you know what your output is going to be so once this trigger wire once you flip the switch it's going to connect this , it will join the 32 and the 87 and then you will have 12 bolts right here and that will turn on the lights, now the 87, a five point one, which is not very common, but if you need it or if you want to use one for any situation, here is basically where the power from terminal 30 will go until you turn it on, then it will transfer to 87 and disconnect from 87.
basic automotive relay operation and simple wiring
Here I have drawn a

simple

diagram to follow, let's say we have these two lights here, now you have them mounted on your bumper or whatever, you have two cables, one positive and one negative, which with a light you already know. polarity doesn't really matter but we know we need power and we need ground so the universal symbol for ground is lines like this and if you were to mount them on your bumper say you ground the only wire to your bumper assuming it is for your chassis without rust or its layer of dust or something else that basically prevents it from having a good hum, then we have our battery here, naturally, unless you are starting with a completely new vehicle, it will already be grounded. factory for all the other electronics, so for our relay we need a thirty to have an input, so we're going to give it 12 volts from the battery and then let's say we mount this switch here on the dash, okay? that the switch is going to need power because it runs on 85, 85 and 86 work together and that needs to make a complete circuit, so let's say you're 85, we're going to connect to ground and that means we need power on this side.
basic automotive relay operation and simple wiring

More Interesting Facts About,

basic automotive relay operation and simple wiring...

So if we have power, we can do it, you know, from the battery or say you want it to turn on. You can go to something like your fuse box, your fuse block, excuse me, like the accessory outlet or the cigarette lighter and you. You can put what you know in line with that circuit so that it's just on and this works if you don't want your lights to be on or your fan to be on if your key isn't in you can wire it to that and this could just be the on so now we have our 12 volts and with Ettrick John is going to complete the circuit here which will essentially close this path here now we have our 12 volts coming from the battery and going through a fuse and now we just need a place to go .
basic automotive relay operation and simple wiring
If you're not familiar with series versus parallel circuits, you know, look at that on the website or look at the other videos and there's an explanation of that, but we have the ground on the lights and we're going to need power, so if you put them together, we can send the energy directly to these two lights. Now the difference between series and parallel is very fast, basically, if I ran, you know these two lights in series would be like this, so basically you have your positive and negative 12 volts. This is a horrible drawing. Sorry, but they are aligned with each other, so let's say if this bulb is here. burns out, this is going to destroy the entire circuit, which is a serious circuit, there are also different aspects as far as amperage and current draw, but like I said, that's in a different video, so for now what we're going to cover do is We are going to make a parallel circuit and this will ensure that if this bulb goes out this one still works and they will both get their 12 volts there will be no voltage drop so they will both be as bright as each other like I said this It is a very simple explanation.
basic automotive relay operation and simple wiring
If there are any questions feel free to post them on the Facebook page or email me and stay tuned for more videos thanks for watching but you.

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