Bought a fog light switch to replace my old one but.....

 

The old one has three terminals earth feed to relay and feed to lights....

 

The new switch has also three terminals but these are "common" "N/C" and "N/O"???

 

Any ideads which of these three relate to the old terminals????

 

Thanks

Not really sure what you already have, but this is what you should have!!.....

 

A 12v+ feed coming off the lighting circuit, this will go to the common on your switch.

From the 'N/O' (Normally Open) contact a wire 'should' go to the coil contact of a relay.....

 

You should also have some sort of 'Tell Tale' illumination, to let you know when the fogs are on. This can either be within the switch body (doesn't sound like it is) or next to the switch position. Fed from the wire off the N/O contact and an EARTH.

 

..... From the other coil contact on the relay, this will go to EARTH.

On a standard relay, you'll have two futher contacts, these will be common and N/O.

Common will be the incoming (fused) 12v+.

N/O will go the the fog lamp/s.

 

It looks like you need to do a little checking of where the wires go.

 

HTH

1 terminal to fog

1 terminal to earth/ground

1 terminal to battery live

 

as dave says one feed will be for the illumination,use a multimeter to find 12v+source