Re: 86 samuria . The right head light is dim. I repaced...
The common cause is that the wire for dip beam is badly corrioded and not making a good connection.
Unplug the connector and inspect all the wires and terminals at the headlight.
Clean and replace the terminals if needed.
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there must be a short circuit which powers tail lights and brake lights. probably you have a dual filament bulbs which have both brake and tail light together. check for bulb, socket/or bulb housing and harness of that light.
it sounds like you have a bad connection on the left headlight either the earth or the power wire,check the connector on the headlight bulb plus all the other wiring & connector plugs.....hope this helps.....cheers.
i think you hit the nail on the head with the ground problem,if you remove the bulb from the head light assembly,wiggle the black wire to see if the bulb gets brighter,if it does remove the bulb and clean and tighten the ground wire end.if it does not get brighter from a wiggle,connect the ground end of a test light to the positive post of the battery and probe the black wire,test light should light,if so replace the light socket.
If only the headlights are dull and not putting out the correct light, I would suspect a bad ground (earth) connection somewhere in the headlight circuit or the fuse for the headlight circuit. Something is causing excessive resistance and causing less voltage to be provided for the headlights. If all the lights are dimly lit, then I would check the charging system, the battery and the ground cable for the battery, chassis, and engine.