My dad has an old Volvo V70 from 2001.
One of the blinkers (that yellow light that you turn on if you go left or right) is not working properly. Sometimes it works, sometimes it doesn't. We opened the hood and touched some wires etc etc we came to the conclusion that once we tighten the light it starts blinking and when we let go of it, it stops working. Or if we loosen the light as much as possible it starts blinking and once changed it stops.
So I'm wondering what could be the issue here and how can we fix it?