Relay to turn power off to solenoid

[artistwantab]

Hey everyone,

I am new here and by no means an electrician.

I have a solenoid valve that needs to turn off when my ignition turns on. I also would like to turn on the solenoid with a switch when the valve is needed.

Here is my attempt to wire a relay to achieve the needed task.

Any help is greatly appreciated.

 

[artistwantab]

Am I completely off or do you guys need more information?

Just trying to get some input

 

[James]

It looks wrong to me.
you need to send 0v to coil -ve
ignition switched live to coil +ve

your output should go from com to n/c

it looks like your diagram will join 0v and 12v +ve together when the relay is not energised and will therefore be a short circuit.

 

[artistwantab]

Thank you. I really appreciate the help.

I am young (16) and trying to do this on my own for a van build I am doing. I want to learn this and I have watched as many youtube videos as I can but still not there. It seems easy to understand when they go step by step in a video.

So let me go step by step so I can learn something. Is this correct?

The solenoid is now?

BTW...if you can recommend videos or what to read I don't mind the work.

 

[artistwantab]

Thank you. I really appreciate the help.

I am young (16) and trying to do this on my own for a van build I am doing. I want to learn this and I have watched as many youtube videos as I can but still not there. It seems easy to understand when they go step by step in a video.

So let me go step by step so I can learn something. Is this correct?

The solenoid is now open?

BTW...if you can recommend videos or what to read I don't mind the work.

The Solenoid is now OPEN.

 

[Avo Mk8]

I have a solenoid valve that needs to turn off when my ignition turns on. I also would like to turn on the solenoid with a switch when the valve is needed.

Here is my attempt to wire a relay to achieve the needed task.

Hi
If the relay you are using has the internal wiring I've shown below, which I presume it does, I would say your first diagram is correct (but see update below!)

Atristwantab - an issue about the diagram is that your relay has pin numbering of one type of relay (B) but the labelling of what the contacts are, are for the other type of relay (A). Be clear which you are using!

Sorry but I find it slightly confusing that your diagram red and black wires don't go exactly to the terminals.

I think you should include an in-line fuse in the feed from the battery to the relay coil for safety reasons.

Since the solenoid will be powered with the ignition off, if your on/off switch is accidentally left 'on', the battery will go flat eventually. You'd normally want to guard against that!

Update: A source of confusion is - is it a type A relay, or a type B relay?
See diagram below. Check which you have as your diagram could be right, or wrong!
Apologies James ?

 

[James]

Well done @Avo Mk8
you were spot on at pointing out my mistake.

 

[Avo Mk8]

Well done @Avo Mk8
you were spot on at pointing out my mistake.

Actually James, I was just as 'wrong',as you!
As I've now added to my post, there are two styles of relay, A & B, and the confusion arises because type A does have a contact connection where I thought the coil normally was.
But the pin numbers on the OP's diagram are for a type B. So there is a mix-up.
Tried to clarify in my post, but not not sure I have ?

 

[artistwantab]

I may have confused you both. I wrote the NO, NC and COM as notes to myself of the relay layout without power so I wouldn't confuse myself.

What I read and watched on youTube is that without power 85 is NC. When you add power 85 becomes closed and 87 becomes NC and 85 is now NO .

I am happy to know I was close with my first diagram.

Since the solenoid will be powered with the ignition off, if your on/off switch is accidentally left 'on', the battery will go flat eventually. You'd normally want to guard against that!

The only way I know how to do that is...

Sticky Notes or timer light switch.

Is there more of an elegant way of doing it. BTW. The solenoid only uses .75 amp.

Here is the latest updated drawing.

 

[artistwantab]

Btw...thank you both for helping a noob.