On my Mk3 Fiesta both headlights work fine on dipped beam, but only the left hand side worked when switching to full beam

This is strange as they both use the same bulbs - ie dipped and full beam elements within same bulb.

I have swapped the bulbs over and still no change.

Also played about with the wiring and no change either - any ideas? This problem started totally out of the blue

 

probably the stalk, easily replaced and worth trying

 

It's a bad ground. I've seen this a lot on older escorts and fiestas.

 

diagonsis is easy...

Check for power (12v) both sides.... so check fuses as well.

Check grounds.

That should allow you to find the problem, be it a ground or a stalk!

Alex

 

Where are the grounds i should be testing? The ones connected to the inside of the wing?

What the common problem with the stalks exactly - the cars a mk3.5 to be specific (and i have heard somewhere thier stalks are different from mk3's)