[Alaska Jim]

There are 6 possible reasons for dim headlamps. being 6 volt has nothing to do with it. 1. bad grounds ( dirty, corroded, or bad contact with bare metal due to paint) 2. wrong size battery cables. 6 volt cables need to be of a heavier gauge than a 12 volt cable. 3. a bad or incorrectly operating generator. 4. Bad, or incorrectly adjusted voltage regulator. 5. Bad, or low charged Battery. 6. loose generator belt. also be sure to run a ground from the body to the frame and a ground from the frame to the engine, and the battery ground cable to the engine . also on the grounds, if the headlamp bucket is painted , it may not be grounding, run a ground straight from the bucket to an unpainted metal area and see if it makes a difference