Hi, 

Brought my A5 few weeks ago and had problem with taillight, changed it and within the space of 12 hours its gone again?

Any ideas on why?

Thanks

Hi Peter

Have you checked to see if all the cables are in good condition? also any leaks that could mean water is falling onto the wires somewhere? 

Regards

Bradley

Hi Peter....welcome to the Forum

As Brad-B5 has mentioned about the wiring/connections, etc or alternatively you could replace the bulb with an LED...lasts a lot longer

http://www.audiownersclub.com/parts-results/A5-S5-RS5/Bulbs--LEDs/174060

Cheers  Trevor

Hello Peter,

Before getting too far into possible causes, it may be worth considering buying another new bulb, but from the main dealer. There are a lot of inferior aftermarket electrical components about, and this may just be one of them. Not sure where you bought it, but try nipping into your local main dealer, and see how you get on. If that fails then at least you have some redress, and assurances that you then need to look elsewhere for problems. 

When you think about this logically, the bulb works initially, so the curcuit must be in order ( if it didn't work and you knew the bulb was serviceable, then you investigate curcuit problems). For the curcuit to be in order and a bulb to blow, then the options are too high a voltage - and where would this system get a higher voltage than any other curcuit on the car? - a higher current, and the same applies, or a bulb which is not capable of withstanding correct voltage and currents for anything more than a short space of time. My money would be on the latter, and trying a good quality bulb first. 

Now some may say that main dealer bulbs are made far east of the Thames estuary as most others are! Fair point.

Good luck in getting it sorted.

Kind regards,

Gareth.