Can Anyone help with a Circuit, Please?

[rogerthebodger]

I did wonder about a relay, but wasn't anxious to add the extra current. Nosing around the internet, it does seem that relays are available that draw a few ma, so I'd still be better off than the original light with its bulb, They're designed to be mounted on a PCB, but I suppose I could solder the wires directly or, perhaps better, use a bit of stripboard, which I reckon would be more robust.

Is the switch a 3 position switch if not you will need a switch to switch power to the switch otherwise one or other light will be on all the time

Buyers 6391103 Rocker Switch,Round,Black,On/Off/On | Zoro.com

This looks like a similar type switch which is on off on that could be suitable

 

[PaulRainbow]

I did wonder about a relay, but wasn't anxious to add the extra current. Nosing around the internet, it does seem that relays are available that draw a few ma, so I'd still be better off than the original light with its bulb, They're designed to be mounted on a PCB, but I suppose I could solder the wires directly or, perhaps better, use a bit of stripboard, which I reckon would be more robust.

Neither #40 or #41 will work.

You can do what you want by using a single, latching, changeover relay and two switches, if you can find a mon-on switch to match the ones you have. The on-off switch will be connected to one of the relay outputs and the lights. The mom-on switch would connect to the energising coil of the relay.

Turn the switch on, then press the mom switch to change the state of the relay, to turn on the light you require. Fit a pair of miniature LEDS to the relay outputs to indicate which light is on.

EDIT; a quick search didn't turn up a matching mom-on switch, but how about https://www.durite.co.uk/048500-black-momentary-on-push.html

 

[rogerthebodger]

Neither #40 or #41 will work.

Why will a 3 position on off on switch will not work

We do not know what type of switch the OP has currently which could be a 3 position switch as it seems that the switch posted did operate the masthead lights

Your solution requires 2 switches where a single 3 position would be a much neater solution

switch I proposed

spec in #41

 

[PaulRainbow]

Why will a 3 position on off on switch will not work

A on-off-on double pole switch will work. That's not what the OP has.

We do not know what type of switch the OP has currently which could be a 3 position switch as it seems that the switch posted did operate the masthead lights

We do know what the OP has. It is a single pole on-off switch with an LED.

Your solution requires 2 switches where a single 3 position would be a much neater solution

But there isn't a DPDT switch available in the style that the OP has and he wants them to match.

switch I proposed

spec in #41

This switch cannot possibly work as you described. It is not a DPDT switch.

A DPDT switch has 6 terminals, more if has an LED indicator or illumination.

 

[rogerthebodger]

Ideally the OP needs a 3 position on off on Double pole switch to match his current one

As you say the OP cannot find a Double pole on off on switch to match his existion.

I found a single pole on off on switch that looks like his current switch.

Add 2 relays to be driven by the single pole switch from the 2 on positions will then give a DPDT to drive each lights with the required polirity to drive the circuit as specified by VicS and others.

Your solution requires 2 switches and a relay . This is as I understand not what the OP wonts

Time to stop digging and let the OP cone back with what he prefers.

 

[wonkywinch]

SPDT switch with centre off position
DPDT 12v relay

Relay coil current negligible
Don't forget to add a fuse in the 12v line

 

[PaulRainbow]

Ideally the OP needs a 3 position on off on Double pole switch to match his current one

Already said that, you said he could use an existing single pole, single throw switch

As you say the OP cannot find a Double pole on off on switch to match his existion.

I found a single pole on off on switch that looks like his current switch.

Link please ?

Add 2 relays to be driven by the single pole switch from the 2 on positions will then give a DPDT to drive each lights with the required polirity to drive the circuit as specified by VicS and others.

Your solution requires 2 switches and a relay . This is as I understand not what the OP wonts

2 switches and a single relay, or one switch and 2 relays, almost 6 of one, half a dozen of another. The single, latching relay has the advantage of no current draw when switched to either light.

Time to stop digging and let the OP cone back with what he prefers.

You couldn't remain civil for long, could you ?

No digging from me, i posted one suggestion, that works, up to the OP if it suits his needs or not. You posted two suggestions that cannot possibly work posts #40 and #41, now you're trying to dig yourself out of the hole.

 

[rogerthebodger]

Already said that, you said he could use an existing single pole, single throw switch

No I said he could use the existing switch I never specified the type as the OP never specified you just assumed it is a single pole single throw

Link please ?

I posted a link in my post #41

2 switches and a single relay, or one switch and 2 relays, almost 6 of one, half a dozen of another. The single, latching relay has the advantage of no current draw when switched to either light.

To me the OP wished to use the existing switch and not add another or different style

You couldn't remain civil for long, could you ?

Just returning the comment you made about me several times in the past

No digging from me, i posted one suggestion, that works, up to the OP if it suits his needs or not. You posted two suggestions that cannot possibly work posts #40 and #41, now you're trying to dig yourself out of the hole.

You do seem to have an issue with me and take every issue to comment and critique my recommendations.

Comments have been made in the past about bickering.

My conclusion is that any comment that differs you attack try to bolster you ego and your business. It dose become tiresome.

wonkywinch has provided the solution so no further comment needed​

 

[PaulRainbow]

No I said he could use the existing switch I never specified the type as the OP never specified you just assumed it is a single pole single throw

It is clearly a SPST switch, it only has 3 terminals.

I posted a link in my post #41

To me the OP wished to use the existing switch and not add another or different style

Indeed he does wish to use the same switch, unfortunately, that switch does not come in DPDT. The one you posted is not the same, similar, but not the same.

You do seem to have an issue with me and take every issue to comment and critique my recommendations.

When you suggest using a SPST switch, which cannot possibly work, it's something that needs to be mentioned to save the OP and anyone else reading this in the future from wiring the switch up incorrectly.

Comments have been made in the past about bickering.

My conclusion is that any comment that differs you attack try to bolster you ego and your business. It dose become tiresome.

​

Not sure how giving my time freely and sharing knowledge bolsters my business. Surely giving things away does the opposite ?

You didn't leave me on ignore for long, couldn't resist starting arguments. Please put me back in your ignore list.

 

[Spanjaard]

As VicS says.

See Page 37 for sketch showing wiring.

http://www.melody-in-blues.org/downloads/electrical_12volthandbook.pdf

Very nice PDF book. Thank you.
I am going to print it and keep it on board, that that is where it will be required...

 

[Stemar]

Thanks everybody.

The weather's good today, so it's more "glorious" sanding. The rest of the week's wet, so I'll have the time to study this and see what I can come up with.

I can get matching 2 way switches, and I think there should be a way to get them to work with a relay, but it's going to take sitting down with a pad and pencil to try things out.

Just a thought - I haven't looked on Alibaba or Tema. Is there any point, or would I have to buy 100 of 'em?

 

[PaulRainbow]

Thanks everybody.

The weather's good today, so it's more "glorious" sanding. The rest of the week's wet, so I'll have the time to study this and see what I can come up with.

I can get matching 2 way switches, and I think there should be a way to get them to work with a relay, but it's going to take sitting down with a pad and pencil to try things out.

Just a thought - I haven't looked on Alibaba or Tema. Is there any point, or would I have to buy 100 of 'em?

If you can get a matching on-off-on switch, post #46 is the best solution, my suggestion was based on not being able to find a matching switch.

 

[rogerthebodger]

Thanks everybody.

The weather's good today, so it's more "glorious" sanding. The rest of the week's wet, so I'll have the time to study this and see what I can come up with.

I can get matching 2 way switches, and I think there should be a way to get them to work with a relay, but it's going to take sitting down with a pad and pencil to try things out.

Just a thought - I haven't looked on Alibaba or Tema. Is there any point, or would I have to buy 100 of 'em?

As posted in #41

Buyers 6391103 Rocker Switch,Round,Black,On/Off/On | Zoro.com

Sold in units of 4 at $9.16

There could be other suppliers online or in the UK

Try RS

RS PRO SPDT, On-Off-On Rocker Switch Panel Mount | RS

I used a similar type for a central locking setup some time ago

 

[wonkywinch]

https://cpc.farnell.com/unbranded/abrr003/switch-rocker-centre-off-black/dp/SW02926

If you can't be bothered adding a relay and happy to fit a different type of switch then this sort of thing is all you need ..

https://cpc.farnell.com/apem/649h-2/10-a-toggle-metal-dpdt-on-off/dp/SW02434

 

[rogerthebodger]

RS have a DPDT on off on switch that looks the same as you have

KDH3CNA1BBB | ZF DPDT, On-Off-On Rocker Switch Panel Mount | RS