Drivers side headlight has no current

Yes the lights are seperately fused.

the h 7 bulb is a quartz halogen bulb and if touched with the bare fingers has an extremely short life
you have to use gloves when handling the bulbs as the oil from the fingers reacts with the glass when in use and blows the bulbs
they will also blow from bad/ loose ground points and if allowed to arc ( as in welding ) will fail quickly
you should get 12 volts to both bulbs at one terminal while the other is the grounding wire
check for problem relays in the power wire

if it is a hid light system they are famous for the balast going bad. follow the wires from light bulb. if they go into a box then its a hid system and it is the balast box that needs to be replaced. also check the fuses, sometimes there are seperate fuses for each headlight.

Check your tail light and other running light sockets for corrosion.
Pull each and every bulb to check it, also check the back side of the socket.
(Your headlights are not part of this circuit.)
Rust or water with rust will conduct enough current to blow the fuses.
Please revert back to the 20 amp fuse, as you may damage the wires leading to the bulbs in places you won't be able to find or fix.
It's unlikely that it's one of the actual light bulbs, all light bulbs tend to go open instead of shorted, but you can check them too.

HI Matt,
Your issue sounds like a fault, most likely in the rear lights. Current is feeding from the brake light circuit, into the running light circuit. The most common causes are a bulb filament broken and touching the running light circuit, and loss of ground.
observe the rear lights closely and you should get a clue as to which light is failing....but if not, just pick one....
I would run a temporary ground and test again, if no results, pull the brake light bulbs...
Transient current is often difficult to wrap your mind around, until you understand what can happen.
Doc

most newer vehicles have individual fuses and or relays that controls each headlight separately, check the fuse panel under the hood, inside the lid there is usually a listing of what the fuses and relays do. look for drivers side low beam and take a look at the fuse, if it blown, try to replace the fuse, but there is usually a reason why it blew in the first place.
How did you test to see if the bulb was still good? ive seen dead bulbs that still look ok, try and plug the bulb from the non working side into the working side and double check.

There are seperate fuses for the right and left lights. The fusebox should be under the dash, on the driver side.

no it will not
it sounds like the bulb is bad
clean the corrosion with a small wire brush
and try a new bulb

The tail lights in my sister's '90s Subaru had a similar problem, and nobody could diagnose it, so she just kept a bunch of fuses in the car. (When she replaced a fuse, it would be a while before it blew again -- days, weeks or even months).
In your case, there's a continuous short circuit somewhere. I'd start with the tail lights themselves -- remove the bulb on one side, replace the fuse, then test. If the other bulb lights and the fuse didn't blow, you know the problem is in the wiring to the bulb you removed. If the fuse DID blow, replace the bulb, remove the bulb from the other light, replace the fuse and test again. Examine the wires carefully looking for nicks or bare insulation.
If the fuse fails whichever bulb is installed (or even if no bulbs!), then the short circuit is probably at the fuse box connectors for those wires, or inside the fuse box itself.
I assume you're talking about the tail lights that turn on and off with the headlights. If you're talking about the brake lights, the test procedure is the same, but don't forget about the high-mounted center brake light, if your car has one.

when you got the spark chances are you shorted the receptacle for the bulb on the low side you should check the fuse for this . the drivers side low beam worked before so i would say you blew the fuse. on the passenger side check for broken ,frayed ,or loose wires in the light harness and the plugs them selves chances are you will find a short in them. please rate this solution