Coffeelandy · Mar 13, 2017

Right, I'm almost there but can somebody tell me what the pos and neg are between the switch and relay on the diagram?

Bobsticle · Mar 13, 2017

No idea but one might be the poz feed for switch lamp/led and one the neg feed for ye relay.

Coffeelandy · Mar 13, 2017

Bobsticle said:
No idea but one might be the poz feed for switch lamp/led and one the neg feed for ye relay.

Ah that makes sense so I plumb in a low voltage feed from existing wiring maybe so the switch lights up when it's on?

Roaming Wombat · Mar 13, 2017

Is it an illuminated rocker switch? Looks like the power rail for the switch light/LED

Bobsticle · Mar 13, 2017

Coffeelandy said:
Ah that makes sense so I plumb in a low voltage feed from existing wiring maybe so the switch lights up when it's on?

Dont plumb anything in on my guess................. worth a test to see though.

Coffeelandy · Mar 13, 2017

Roaming Wombat said:
Is it an illuminated rocker switch? Looks like the power rail for the switch light/LED

Yep it is.

Sakara · Mar 13, 2017

Battery feed. The feed to the relay coil is from that via the rocker switch. The feed on the right hand side is what powers the load, via the fuse and the relay contacts.

Coffeelandy · Mar 13, 2017

Sakara said:
Battery feed. The feed to the relay coil is from that via the rocker switch. The feed on the right hand side is what powers the load, via the fuse and the relay contacts.

Um I thought the batt feed was before the fuse?

Bobsticle · Mar 13, 2017

Coffeelandy said:
Yep it is.

Good. Do I win a prize?

Roaming Wombat · Mar 13, 2017

IIlluminated rocker switches sort of have standardised pin outs

1 : not used
2 : +V DC
3 : Accessory
4 : not used
5 : not used
6 : Switch Illumination
7 : GND
8 : GND

Coffeelandy · Mar 13, 2017

Roaming Wombat said:
IIlluminated rocker switches sort of have standardised pin outs

1 : not used
2 : +V DC
3 : Accessory
4 : not used
5 : not used
6 : Switch Illumination
7 : GND
8 : GND

I reckon the mystery inputs are to illuminate the switch. I'll try it and see.

Sakara · Mar 13, 2017

The feed for the load is fused on that drawing. The feed to the coils side isn't.

Roaming Wombat · Mar 13, 2017

Coffeelandy said:
Um I thought the batt feed was before the fuse?

Look at it like 2 seperate circuits join by the relay,

To the left of the relay is one circuit (low load) which is the control circuit for the relay.
To the right of the relay is the other circuit (high load) which is what you are trying to power/control (such as spot lights etc)

Both circuits need a +V DC input, and both should be fused. A nice small fuse on the input to the switch/control circuit, a suitably big fuse on the high load circuit.

Sakara · Mar 13, 2017

Coffeelandy said:
I reckon the mystery inputs are to illuminate the switch. I'll try it and see.

The relay is 2 separate circuits. The coil side is fed from the inputs you are asking about and the load is from the circuit on the right. If they were joined then there would be no need for the relay.

Edited due to being an idiot

Coffeelandy · Mar 13, 2017

Roaming Wombat said:
Look at it like 2 seperate circuits join by the relay,

To the left of the relay is one circuit (low load) which is the control circuit for the relay.
To the right of the relay is the other circuit (high load) which is what you are trying to power/control (such as spot lights etc)

Both circuits need a +V DC input, and both should be fused. A nice small fuse on the input to the switch/control circuit, a suitably big fuse on the high load circuit.

Got it! Thanks Gents I'll let you know how I go.

zeaphod · Mar 14, 2017

Sakara said:
The relay is 2 separate circuits. The coil side is fed from the inputs you are asking about and the load is from the circuit on the right. If they were joined then there would be no need for the relay.

Edited due to being an idiot

+1 The relay isolates the switch from the load, so you need a power supply at both sides. You could tee one off the other, but for example, the +ve feed for the switch side would often come from a circuit that was only live when the ignition is on. The +ve feed for the other side is usually your new fused supply to run the e.g spotlights.

Coffeelandy · Mar 14, 2017

zeaphod said:
+1 The relay isolates the switch from the load, so you need a power supply at both sides. You could tee one off the other, but for example, the +ve feed for the switch side would often come from a circuit that was only live when the ignition is on. The +ve feed for the other side is usually your new fused supply to run the e.g spotlights.

I'm going to use a spare 12v socket wire to power my switches and relays.

zeaphod · Mar 15, 2017

Just make sure it's fused somewhere - in case a previous owner has altered things!

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