Been there, done that...
Assuming your model uses the 9004 bulbs, odds are the connectors are shot. These things melt over time even with normal wattage bulbs, and very quickly with high-watt bulbs.
Totally underbuilt and very 'unMercedeslike".
You can buy replacement 9004 connectors at Autozone and splice them on.
They are much beefier than the originals.
Only one was really bad, but both headlights got brighter due to less voltage drop.
Euros are much better, but this fix is under $10...
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1986 300E 5-Speed 240k mi.
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