Wiring up a relay

**Mark-R** · 5th March 2013, 15:14

Hi all can anyone help me out im wanting to wire my side lights to my numberplate light so they come on when i unlock the doors so can any one tell me what points the wires go to on the relay please.
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And my sidelights are all ready wired up to come on with the ignition would this affect it and will it affect it when the lights are on and the numberplate light comes on will it not over heat or anything?

**marc vectra sri** · 5th March 2013, 15:54

I've done it u don't need a relay just wire it straight to the number plate wiring remove boot trim ul see the wires think it's a green wire.

**Mark-R** · 5th March 2013, 15:58

Originally Posted by marc vectra sri

I've done it u don't need a relay just wire it straight to the number plate wiring remove boot trim ul see the wires think it's a green wire.

Tried that mate but cos my light come on with the ignition the wire gets really hot for some strange reason. And was told I need to hook a relay up so it doesn't over heat.

**Critch** · 5th March 2013, 16:16

30 is batt pos

85 or 86 is power control and other would be negative

87 would be on to you side lights

**Mark-R** · 5th March 2013, 16:22

Originally Posted by Critch

30 is batt pos

85 or 86 is power control and other would be negative

87 would be on to you side lights

So

30 bat

85 or 86 to the number plate live

87 to the side light live

**Mark-R** · 5th March 2013, 17:55

Don't think this is going to work it works fine doing it without having it connected to the fuse box but soon as I connect the wire from the fuse box so they come on with the ignition a get a beeeeeeeping noise from under the bonnet.

Am I doing something wrong.

**Ben50n** · 6th March 2013, 08:30

You will need to earth the other side of the relay switch, so you can have power on 85 via the sidelight switch, earth on 86 or vice versa.

**Z80** · 6th March 2013, 10:14

Here is a drawing showing how the relay works, and what use are each pin...

**Leemarksmith** · 6th March 2013, 10:19

Why not just take the dash feed one, same job no relay, there's a video of mine on YouTube...

I'd only use a relay if you wanted to power it from a stronger source then the trigger used to light it (as its not powerful enough) as the plate is your trigger and can handle LEDs a relay is over kill IMO and not needed...

**Leemarksmith** · 6th March 2013, 10:36

If you don't want to use the Dash feed, or plate (need double unlock for sidelights to fire :-/) this is how I would do it if wanted to over complicate a simple matter lol...

30- ignition live
87- sidelights (ignition) normally closed
87a- sidelights (fob/interior triggered) normally open

85/87 interior light trigger - brown & brown/white

So... Your side lights will be on with ignition once keys in etc (relay closed) when keys out and interior light fires the lights remain lit, or light when approach the car and press the fob (relay open)... Only issue may bring up it key not in ignition and you use interior light, but side lights will just come on then off with the light, but probably already on from just opening your doors