Dandy. We got the obvious out of the way. I would even have been happy with a visual inspection, but failure of both at the same time would not be common. The next thing is to do some checks at one of the sockets. To make it easier. Leave both bulbs unplugged. With the headlights turned on bright, you should find 12 volts on one terminal. A test light or a digital voltmeter can be used. If you find that, check it again with the other bulb plugged in. If that 12 volts is still there, we have to fix the ground circuit. If it goes away with one bulb plugged in, there's a break in the wire or switch that we have to find. Turn the head light switch off, then recheck for that 12 volts again. If it's still there, the switching is done on the ground side and will be a little more involved.
If you don't find 12 volts, first look if there's a head lamp relay in the fuse box under the hood. If there is, we can use that to do more diagnosis. If there's a low beam and a high beam relay, switch them to see if now the low beams don't work. Relay failure is not common, but that's a quick test.
Sunday, October 19th, 2014 AT 9:48 PM