Do you have any signs of a weak battery (slow cranking)? What speed is your
engine idling, and is it smooth or rough? If you try to lower the power
windows while idling, do the lights flicker worse (voltage drop)?
In my experience this is caused by poorly fitting headlamp bulb retaining
clips. These are always tricky to fit properly in the vehicle, plus they
weaken with age.
I eventually fixed my 9000 by removing the headlamps and working on the
bench (actually the kitchen worktop).
Headlamps come out really easily - (from memory) remove rad' grille, pop the
orange indicator unit (squeeze something round the back), unplug the
electrics, then it's a question of a single bolt (or is it two?) and lift
the headlamp out.
To protect the unit on the bench place it face down on cloth/foam/newspaper
padding. You should be able to see exactly how the clips are supposed to
fit, and can use long-nosed pliers to make any necessary restoration of
shape. Ultimately, you may need to buy new clips.
Took me about 15 minutes per side, plus 30 minutes removal/refitting.
No flickering since.
Best of luck with this
Try re-soldering all the contacts of the rheo-stat, -> the thing that lets
you adjust the dim of the back light,
second the headlight switch,
third the ignition switch are a common fault on those models.
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