Vehicle & Technical > Discovery

Wiring for spots.

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Andy.:
Right had another look tonight, both the front fogs and spots have just one wire coming into the interior via the relays which are housed in the engine compartment.

The other wires from relays are the earths, battery feeds and persumably the feeds from the light units themselves.

The roof lights have a feed coming from the lights into the interior, and then into a relay pin 87. 85 is earthed. 30 goes to a brown wire from the ignition and 86 goes to the switch which is in at the minute. This also has another red wire looped into it which goes to a white wire again from the ignition  :?:

There is a thick blue wire which links both the roof light switch and the fog switch.

Here is also the back of the switch with the wires.

Andy.:
And another one.

ChrisW:
What you are interested in is the wires that go from the switches to the 85 pin on the relays - this is the switch wire that operates the relay.

Do you intend that the new switches can switch the lights on regardless of what state the ignition or the normal lighting is in?
If so, you need to run a supply (fused) off the battery to one side of the switch and off the other side of the switch to pin 85 of the relevant relay.

If you want the front fogs to only come on if the sidelights are on then the switch wire needs to be connected from the sidelights to one side of the switch and off the other side of the switch to pin 85 of the relevant relay.

If you want the spot lights to only come on if the headlights/main beam is on then the switch wire needs to be connected from the headlights to one side of the switch and off the other side of the switch to pin 85 of the relevant relay.

When we did your roof spots did we wire them up so you can have them on, off or on with main beam? I think we did, in which case you will have relays spare when you rewire, if you check the relays one should have a switch wire connected directly to the battery (I think we picked it up off the ignition cabling) and one switch wire will be connected off the back of one of the headlamps (I think - memory fading fast!) This is where the multimeter really comes in handy!

Don't forget, some wiring diagrams on my webshots... under Disco Mods on page 2 I think.

ChrisW:
Looking at the pic of the back of the switch my guess is...
Red & Green (?) supply in from battery/switch circuit (sidelight - main beam etc)
Red & Orange - switched supply out to operate relay
Thinner red & orange - loop to indicator on switch
Black - earth for indicator on lamp
Based on the above, when the switch is made the indicator lamp comes on - not sure if there's supposed to be a connection to the dash lights or anything tho.

Again, this is where the multimeter comes in handy!

Andy.:
Cheers Chris excellent  :D

I'm sure on the roof light relay 85 pin was earthed, might be wrong and did'nt check the other two, but I think I have it now.

There are only three wires off the switches, earth for the lamp and then to the feed and relay switch so I don't think a connection to the dash lights is needed.

Yes your right about the roof lights on/off/on. On with no ignition on, off and on with main beam.

How do I find out which wire is on and which is switched off on the switches  :?:

Cheers again those diagrams on your webshots are very handy.

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