Left Brake light has issues 4 sho -Help please?

[ad03avant]

Why is my left (drivers side) tail light still not working? I removed it and moved the bulbs around to see if there was a bad one but everything is ok. I even moved brand new blubs from a new housing I got (for the right side) over...

Driving me crazy. The fuse is good and the passenger side works. Its just the driver side that seems to have bigger issues than just a burnt out bulb. I installed an amp on that side of the car and grounded it to metal under the back left panel. I dont see how that could do anything. I sanded the metal and mounted the ground for the amp well.

Any ideas?

Thanks

D

[JoeyVee]

Dude. This sounds stupid. But its the truth. BUY Your bulbs from an audi dealer. Theyre different. I sweat to ufcking God. I bought all 6 at once and just changed em all so Id never have to deal with that problem again They watts from after market bulbs are the same but the voltage is different. DONT ASK ME WHY. Try that BEFORE you go crazy and or spend alot of $$$.
This was the case for me when my lights worked but kept throwing that god damned beep brake light warning. drove me nuts. either way. Try this first.
Partially drunk but still giving good advice.

[ad03avant]

I just ordered an OEM tailight housing for the other side. It came from audi with bulbs. I didn't need all of them for the other side so that is what I used to replace theotehr side.

So I was using genuine audi parts.

D

[aaronz]

Make sure you don't have a convt bulb in there. That was my exact issue and Audi gave me a bulb for the cabriolet. Worth a shot.

[diagnosticator]

Why is my left (drivers side) tail light still not working? I removed it and moved the bulbs around to see if there was a bad one but everything is ok. I even moved brand new blubs from a new housing I got (for the right side) over...

Driving me crazy. The fuse is good and the passenger side works. Its just the driver side that seems to have bigger issues than just a burnt out bulb. I installed an amp on that side of the car and grounded it to metal under the back left panel. I dont see how that could do anything. I sanded the metal and mounted the ground for the amp well.

Any ideas?

Thanks

D

Do this:

Using a digital multimeter, remove the tail light bulb from the socket, turn the parking lights ON, then measure for voltage at the bulb contact in the socket, with the black test lead connected to chassis ground. The meter must show about BATT voltage. If it doesn't, there is a broken wire to the lamp socket. If it does show BATT voltage, then set the meter to read circuit continuity or ohms, and connect the test leads to the socket contact (the second contact, NOT the contact that has BATT voltage,) connected to the brown ground wire from the tail light housing, the other test lead to chassis ground.
The meter must read very low ohms resistance, less than 1 ohm, if it's higher, or infinitely high resistance aka "open circuit", then the brown ground wire is broken or the connection to the chassis is corroded, causing high resistance in the ground circuit for the tail lamp bulb.