HI, really need some help with a problem that has just appeared. the rear offside indicator bulb on my ML 350 2009 has just started to play up. I have checked the bulb and the bulb is fine. when the offside indicator is put on the brake light also flashes this is sporadic so will only happen every now and again then some times it will be okay! When this happens it will click fast and show a rear right bulb error on the dashboard. the nearside indicator is absolutely fine, does anyone have any idea what this could be down to? I have a feeling it could be a bad earth but where are the earth points for the lights?