as the title states i need to replace the demister and air con switch globes/bulbs. the light that lights up the switch picture when the parkers/headlamps are on for both and the switch lights to show they are on have blown. i took the switches out a tapped the globes a little and then when reassembled they lit up with the parker/headlamps activated for a day or so but then stopped. this tells me the filament is broken ... also the air con switch lights up green when switched on to show its on, but the demister doesnt light up at all. i am not going to the wreckers as i want new globes in there and i want to change the colour anyways...

that being said....(sorry to drag on a bit but i want to explain properly) my question is this...do the new globes require resistors? i cant tell if the old ones have resistors but also i will be using led globes rated at 9 - 15volts (they may possibly have resistors in them already if theyre rated at that voltage (the new led globes are rated a 9 -15volts) or...
because those lights/globes are on a circuit that contains a dimmer switch (on the right hand side of the cluster cover...its a TF Magna Exec) which has resistors in it anyways, does this mean i dont need to use extra resistors at all??
thanks for info in advance guys
Anthony

If the LED lamps are rated at 9 to 15 volt, then this suggests the LED already has a internal current regulator that will allow the LED to light up with an approximately constant brightness over the 9 to 15 volt range. Sometimes the regulator is an electronic constant current source, and sometimes it is an included series resistor. Either way it should be OK for you. Biggest problem in changing parts is whether the mechanical arrangement of the old parts suits the new part.
One of the problems in changing incandescent lamps for LED types is whether the lamp voltage is used as an input signal to some computer function. With incandescent lamps, the lamp voltage is very small when the lamp is off (less than 20 millivolt); but with LED types, when the lamp is off, the lamp voltage can be up to around 1.5 volt and this is enough to tell some electronic stuff that the lamp is on. This happens typically with LED tail lamps, and the result is that the cruise control doesnt function cos it thinks the brake is applied. So just be aware.
Hope this helps.

If the LED lamps are rated at 9 to 15 volt, then this suggests the LED already has a internal current regulator that will allow the LED to light up with an approximately constant brightness over the 9 to 15 volt range. Sometimes the regulator is an electronic constant current source, and sometimes it is an included series resistor. Either way it should be OK for you. Biggest problem in changing parts is whether the mechanical arrangement of the old parts suits the new part.
One of the problems in changing incandescent lamps for LED types is whether the lamp voltage is used as an input signal to some computer function. With incandescent lamps, the lamp voltage is very small when the lamp is off (less than 20 millivolt); but with LED types, when the lamp is off, the lamp voltage can be up to around 1.5 volt and this is enough to tell some electronic stuff that the lamp is on. This happens typically with LED tail lamps, and the result is that the cruise control doesnt function cos it thinks the brake is applied. So just be aware.
Hope this helps.

cheers for that. it does help and gives a little more confidence in making this led upgrade work.
I will post up once i do this led globe swap, regardless if it's successful or not.
thanks again rumpfy