Ground must be OK, because the hi beam works...voltages show 9.87 dc
on hi beam, 829mvdc on lo beam...hmm seems to be a discrepancy...
> > On closer inspection dimmer filament (h4 bulb) is glowing, wiring
>> appears to be original, and while the cloth covering is frayed,
>> the rubber? insulation appears intact. As much of the wiring I can
>> check from the bucket back to the loom seems to be "period
>> Question is: Where do I start? replace the connector? check
>> voltages? check connectivity? "Tis a puzzlement"
>This is a classic symptom of a bad ground, so that is where I would start.
>The original ground was a bullet connector shoved into a metal clip, screwed
>to the body behind the horn on each side.
>If checking the ground (including between the clip and the body) doesn't
>solve the problem, then I would definitely check voltages as the next step.
>You know some current is making it to the bulb, so it's important to check
>with the bulb still connected. Right there at the connectors behind the
>horn is where I would start ...