headlite question

Some times a bad connection will flow electricity (multimeter reading) when not under load, BUT under load the voltage drop is so much that there is no flow. try to measure voltage under load and see what you get.

ALSO if you are measuring using the negative post on the battery try using a different ground (IE block or sheet metal) you may have lost battery to engine or engine to chassis ground.

I assume the rest of the car works as expected?