Difflock switch not illuminated

[4WDrifter]

I was recently working in under the dash to connect a wiring loom for a set of electric recaros. Now the difflock switch doesnt light up in the section with the wheel layout diagram on it. The button to press is illuminated and the additional bulb lights in it when I press it. I've looked inside it and the bulbs look okay and I've swapped it for another and it's the same. I realise I could have two switches with the same bulbs blown but unlikely I thought. I sense that something might have been knocked when we were working up in under dash but where? Any ideas?

[Monkeymagic]

My switch is the same the two little lights are on but the main illumination doesnt.
I just assumed it was a blown bulb. I look forward to the answer.

[4WDrifter]

There are 3 bulbs in that section and I reckon that it's unlikely all three have blown at once.

[UrS4boy]

I was recently working in under the dash to connect a wiring loom for a set of electric recaros. ... Any ideas?

Here is one diff lock wiring diagram (below):

More diff lock info (including diagrams of the switch assemblies so you can check the bulbs):

http://forums.quattroworld.com/s4s6/msgs/170940.phtml

[4WDrifter]

I've just changed the bulbs and now it's working!
I took them out of an old switch but I need one more.
Does anyone know an exact specification for the bulbs?
I will try to post some photos.
There is no writing on them at all.

[kulster]

Mine wasn't illuminating when I bought the car but since the heater matrix got done the switch now lights up when the lights are switched on, try tapping it

[4WDrifter]

Pics of bulbs.

[4WDrifter]

What did you do to your heater matrix?

[kulster]

Change it mate, it started to smell of coolant and my windows were left with residue which I hated, because I love my windows to be smear free

[newsh]

I posted details of the bulbs the other day, I'll find the thread

http://www.s2forum.com/forum/showthread.php?t=69569&highlight=finally+clocks

[4WDrifter]

I'm still struggling with this. I've replaced all three bulbs and now the switch is lit when the car light are on. However when I press the button on the switch to engage the diff lock a triangular light illuminates on the button but the green dot, or rather the bulb behind it, doesn't light.
I have two switches and it's the same for them both.
Any ideas lads?

[UrS4boy]

Any ideas lads?

Umm...maybe

1. The diff lock actuator is b*ggered and therefore the F100 diff lock acknowledgement switch is not engaged OR..

2. The F100 diff lock acknowledgement switch or the plug and wiring is b*ggered.

http://forums.quattroworld.com/s4s6/msgs/170940.phtml

[Error404]

You probably just need to move the car slightly as the diff lock hub can't always engage when stationary

[s2driveruk]

tested this theory the other day and can confirm, rolling the car slightly does indeed flick up the green 'engaged' light