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Many grounds under the hood......
There are many ground " straps " and connections the hood. The older the car, these sheet metal screws and ring connectors corrode. Usually turn green. remove each ground screw, ring connector, and nut. Sand or brush to a shine of bare metal. Put a decent glob of diaelectric grease(conducts electricity) and re-tighten. Look for ground wire behind the wire looms also.
Because a +/- circuit conducts voltage, it may not conduct enough amperage to fully power a high draw device such a headlight.
Lastly, the circuit relay(small black cubes under the relay box) may be going bad and will not "relay" enough amperage.
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