Have you actually swapped the ballasts over? If you leave the bulbs where they are, and swap the ballasts that'll test the ballast.
Mine was the ballast when I had that problem - check your fuses and whatever is broke is more than likely blowing a fuse when switched on
PS - might take a few fuses when swapping bits over for testing
Also, to get at the ballast is a real thorn in the side!
relays under passenger side footwell might of popped out this happened to me , 4 months later the ballast went lol
it could be the igniter
the square box that sits behind the bulb
Has it got wet?
so you used the igniter from the working light and put it in the faulty side and it worked.s
o the igniter is at fault and not the feed into it
So the igniter from the faulty side lights up the normal working bulb? have you tried the good igniter on the faulty side?Not as far as i know. It shouldnt have. But then again if it did get wet, why did it work in the other side ok?
Sometimes the rubber backing can come loose, it did on mine.
I took the light and lighter from the faulty side, put it in the working side, and the 'faulty' light worked. So both bulbs and lighters are fine.
^^So the igniter from the faulty side lights up the normal working bulb? The 'faulty' lighter lights up the faulty sides bulb. I didnt try the working sides bulb as the other worked fine.
have you tried the good igniter on the faulty side?No, i dont see the need for this, if i have proved that the faulty sides igniter is fine?
^^
I keep confusing myself now.
Basically, i have two working bulbs with two working lighters. But only one side will light up.
Try the good igniter on the faulty side. this would then indicate faulty wiring.
relays under passenger side footwell might of popped out this happened to me , 4 months later the ballast went lol