Help wiring an LED toggle switch

power in and power out to relay wires swop em around ?? are there any symbols/numbers on the contacts on the swithch ??
30 or 15=fusebox
31= earth
86=relay
didnt the switch come with wiring diagram

I did the same, for the same purpose. I'm curse word at electrics but this sorted me out, I used the type at left. HTH-

Pic courtesy of S2 Landy club

Thanks. That is exactly what I have tried, but the LED is only On when the switch is off.
I think the problem may be the relay side. The switch works, but because the switch is connected to the relay, and in effect the circuit is complete even when the switch is off?
Anyway, not critical, it is working, I have just wired it so the LED doesn't come on.

It's a new relay that I have installed.
I have basically copied this guys set up - there is a wiring diagram at the bottom of the page -
www.trdrivers.com/fan.html

The only difference with mine is that I am using an LED toggle switch, instead of a standard one.
So, I have a separate Fan On light - which illuminates whenever the fan is on (working fine).
I want the LED light on the toggle switch to be illuminated only when the manual override is on. This is the problem.

I ahve tried the wires in every combination on the switch, I still can't get the correct result.
I already have the 'fan on' light as mentioned above. That is working fine.
Thanks, still at a loss though. It is not which wires are going to which terminal on the switch, more, am I connecting the switch to the correct thing.

Cool, thanks.
Swapping connections DOES change things, I am just saying that whatever combination of connections to the switch, I don't get the right result.
I'm still confused I'm sorry.......I give up

I'm wiring my fan next week Al, I have exactly the same switch as you, I'll see what happens when I attempt it.
Probably a big fire.

Hold on a sec, does the light stay on when the fan is on?
I think what you've got is the feed from the fuse box is keeping the light permanently on. I'm tempted to put money on that if you wire both the + terminals off the relay, ignore the fusebox, the light will only come on when the relay switches...

I've just tested mine out, both the + terminals seem to turn the light on.

As Garra says, the problem's that the switch is after the relay. There's a couple of ways round this depending on what you'll find easiest.

The trouble is that in your current set-up, (assuming it's like the first diagram garra posted), the only resistance in the relays circuit is the relay it's self, with the LED placed on a parallel circuit taking it's feed from after the relay. With no resistance after it the voltage after the relay is 0v, meaning the LED's getting nothing to it, it's effectively connected to an earth at both ends.

Ideally, you want to place the switch before the relay, that way it's taking its feed from the full 12v that's between the battery and the first point of resistance (the relay), but when the switch is off there's no power for the relay when the thermostat tries to earth it, so you'd have to change the circuit to match garra's 2nd diagram.

One way around this would be to leave it wired as the first diagram, but place a resistor after the switch, before the relays earth (but not the switch's LED's earth, which should be separate). This will give a voltage between the relay and your new resistor, so your feed to the LED will actually have some voltage to take. The trouble here is that the LED won't get it's full 12v, so may appear dim. I'm not 100% what size resistor you'd want for this.

Another way around doing this would be to wire the output from the relay to either of the positive terminals on the switch, and then the earth on the switch to earth, leaving the 3rd terminal unused. This would place the LED in the relay circuit, rather than on its own separate circuit. Again it won't get a full 12v, so might be a bit dimmer.

When you wired it so that the LED came on when in the off position, I'm guessing you had the an earth going to the '+12v in' terminal and the 'earth' terminal, the feed from the relay wired to the 'to switched device'. When it was like that, was the fan on permanently, regardless of the switch, or did it work as it should? If it was working as it should, then in theory, my 2nd option wouldn't work because the LED part of the switch is causing too much resistance and stopping the relay operating. If the fan was permanently on, then my second suggestion should work fine.

Do you just have the relay wired up incorrectly? Using the "normally closed" contact instead of tyhe "normally open"


Pin 86a instead of pin 86.

This would have the effect of turning the fan off when the switch is on.