Hello, my name is Mark and I will try help you with this.
Are the headlamp lenses clear or do they look a bit opaque?
Is there any corrosion on the reflectors?
Is there any dampness inside the lamps?
Hi Mark all appears ok with the condition of the lamp
we are a garage Mark so looking for someone who has this problem to resolve before
Hi Mark on way home now we have checked the basics will check in the morning if you can advise any further
The next thing to check is the supply voltage, the earth connection and the voltage drop across the circuit.
Do the bulbs look bright enough looking into them and it just the beam pattern that is incorrect?
Hi beam pattern is correct we have replaced bulbs already checked earth & voltage drop no sign of corrosion , still struggling with a solution ?
The next thing I would do is connect an ammeter to read what the current draw was.
Did you check the current draw?