well I install my HId's bout a month ago. and one of the transformers.. or ballast are making a noise.. the other side is silent.. anybody know the cause....

 

bump

 

bump

 

I also experienced that on mine. how loud is it? so long as it does not rise up to a point where you can actually hear it with the engine running, it should be ok. ive had mine like that for a year already.

however, my kit sometimes acts weird though, everytime i plan to turn the headlight on, i have to start the engine, turn on the parking light, wait for a few seconds, then ignite the headlights. otherwise, i would end up with one side not starting.

 

check your grounds and make sure theyre solid

 

i have a similar problem, one always lights up completely before the other, and it almost seems like one is bluer then the other.