headlite question

AJ/FormS said
Having12 volts on both legs of the two prong bulb simply indicates that the filament is good.
Click to expand...
one side of a 2 prong bulb should go to ground and if it was properly grounded it would show 0 volts. If it had an open ground it would show 12 volts and indicate the filament is good.


Properly working cir.
Good ground, good filament, test to + terminal of socket
upload_2018-9-28_22-0-0.png

Good ground, good filament, test to - terminal of socket
upload_2018-9-28_22-0-30.png

Open ground, good filament, test to + terminal of socket
upload_2018-9-28_22-0-51.png

Open ground, good filament, test to - terminal of socket
upload_2018-9-28_22-1-13.png


Open ground, bad filament, test to - terminal of socket
upload_2018-9-28_22-1-29.png

good ground, good filament, open positive, test to + terminal of socket
upload_2018-9-28_22-1-52.png