Ok my gf's mk1 55s has gained a fault that is confusing me. When she puts on her indicator it is fine untill you brake then it goes off. I thaught it was to do with the stalk till i was driving behind her and was compleatly in horror. When she puts her indicator on all the back lights flash and when she brakes all the lights are on static apart from the brakelight which blinks. Is this an earth problem?? If so does anyone have any idea which earth it is?? Cheers.

its an earth problem.i would check around the light units 1st and any boot earths.