by Retrohowla » Mon Aug 18, 2014 2:05 pm
Had this issue myself recently, went straight to earths and cleaned them all, front and rear, no joy, replaced a couple earth wires, no joy, cleaned out the bulb holders, no joy, sprayed enough wd40 in all the bulb holders to flood the Serengeti and Bobs your uncle, sorted, next stop for me is new bulb holders, only a matter of time till it does it again.
If you own a transit, learn to weld