hey, do you know how many volts the cabin light is in the necter of the roof? not the map lights but the main door light? and if its not 9v, do you know how i can make the power output to 9v's? thanks

 

It's 12v. I measured it with a multimeter.

 

thanks Ravq, does anyone know how i can make it a 9v instead? is there like a mini transformer or something i can buy like at radiosahck? thanks

 

Resistor...

 

Transformers work on AC (alternating current). You cannot use a transformer to change 12v DC to 9v DC.

 

is there anything i can use or do?

 

Mzmtg said you could use a dropping resistor. I suppose that might serve your purpose... a purpose you did not specify.

 

well im changing the lighting unit but it requires 9v, not 12v. so i was gonna stick it up somehow but i need to change the voltage output. now, is a dropping resistor something i just put into the wiring(circuit) or does it require lots of work? and do you think i can find it at a local radio shack? thanks

 

I think you would just put it in series with the 9v load, but I don't know what value it should be. I guess it would be 0.333 times the resistance of the 9v load. Let's ask one of our electronics experts to step in with more specific advice.

 

I think Daniel is correct.
If I remember right, the typical bulb filament has lower resistance than nominal when it is cold. Therefore at the moment the 9V light is turned on, the current through the filament is higher than when it is warmed up, causing the added dropping resistor to drop a little more voltage so that the 9V light has less than 9V across it.
Since the filament is not a big mass, it'll reach nominal operation in almost no time. We probably can't tell there is a delay, compared to a fixed 9V connected to the 9V light.