86 420 sel headlight globes

The headlights on my Australian 86 420 sel seem a bit weak... Any idea what can be done to make them brighter?

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Try cleaning the contact points/plug and coat with dielectric compound,and also verify all ground/earth are adequate on her and output voltage of alternator is putting out about 13.5V .
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When did you replace the bulbs last? They do not last forever.
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