Do i have to remove the battery to replace headlight drivers side

Daytime Running Lights (DRL) Control Module,
Disconnect the negative battery cable.
Remove the instrument panel lower cover.
Reach underneath the instrument panel and remove the bolts and the daytime running lamp module.
Disconnect the electrical connector.

Lamp Control Module
Disconnect the negative battery cable.
Remove the instrument panel low cover.
Remove the screws and the lamp control module.
Disconnect the electrical connector.

Daytime Running Lamps (DRL) Module (T61)
Below the driver side of the I/P, near the center console

Lamp Driver Module (Notchback)
In the left rear of the engine compartment, near the EBCM
Front of Vehicle/Engine Compartment Component Views
Component Connector End Views
Lamp Control Module (Export, Hatchback)
Behind the driver side of the I/P

You have a bad ground wire somewhere. Try running a new ground directly from the battery to the body of the car, possibly attach it to a strut bolt or something handy to the battery.
Wires run along the drivers side perhaps under the carpet and door kickers or plastic plate in door jam to the back of the car. Open trunk remove left side carpet just behind the tail lights and check this wiring.
Locate the negative wire going to your head lights (only need 1 and run a new wire from it directly to the battery or the ground you made from the battery to the body.

if this is a diesel its a days job,DISCONNECT BATTERY UN DER PASSENGER SEAT take front grill and the front cross member off drain radiator loosen all bolts on radiator do not undo any connections on air con. jack up car remove plastic belly plate remove drivers side wheel and inner plastic arch cover ther is also a strut that needs to be removed,using a screwdiver prise off the fan timing belt then remove 4 bolts underneath that hold the radiator up you will then need to remove drivers side headlight to gain accsess to the bottom alternator bracket, with this done you can then carefully remove the alternator and remove the bush box and replace the bushes

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Turn the engine off, open the hood, and disconnect the negative battery cable (--) with your pliers.

Locate the power distribution box against the firewall on the driver's side of the engine compartment. Flip up the latch and remove the plastic cover.

Determine which headlight fuse you want to replace. The 2001 Ford Focus uses four headlight fuses--one for each headlight. Fuse number 16 is for the passenger side low beam; fuse number 17 is for the driver's side low beam. Fuse number 26 is for the passenger side high beam; fuse number 27 is for the driver's side high beam.

Grasp the fuse with your fingers and pull it straight out of its mount. Insert the new fuse in its place. Replace the plastic cover and reconnect the negative battery cable.

usually the battery and the fuse panel but I have done it without removing anything

Its on the drivers side under the headlight. Remove one cover underneath the car in front of the Drivers side tire. Easy fix,took 1 hour to remove and replace

Open hood, reach behind headlight. If necessary remove battery and coolant overflow tank.
Then reach in behind headlight. There will be a plastic ring on back of headlight. Turn counter clockwise and pull back and slide back out of the way. Then grab the headlight bulb, turn counter-clockwise and pull back to remove. Then unclip the wire harness from the bulb itself and reverse procedure to replace.

No, you just might have to take out the battery. I was able to do it without taking the battery out, but only because I was being stubborn. There is one thing I definitely have to say is that you should change both headlights at the same time. My driver side headlight was the first one to go and I didn't listen and just changed that one, days later my passenger side one went out!

For the driver's side headlight, yes, the battery must be removed to change the headlight. There are three screws but they don't have to be removed, just loosened enough to where the bulb can rotate ninety degrees to pull out. Be prepared to reenter the radio code as disconnecting the battery will cause the radio to electronically lock out. The radio code can be found on the security card or inside the user's manual if you're lucky.

FROM INSIDE ENGINE COMPARTMENT, YOU MAY HAVE TO PULL BATTERY DEPENDING ON SIDE. LOCATE THE WIRE HARNESS TO BULB. TURN COUNTER CLOCKWISE TO REMOVE SOCKET. WHERE GLOVES WHEN HANDLING BULB. REMOVE AND INSERT NEW ONE. REVERSE PROCEDURE