What fuse works the third stop lighton my 1999 s320

their are some electrical issues with s320 throttle valve electric failure --coil pack failure -- check fuses and relays then check battery and connections and try to start with boost if starts check and test battery and alternator --and check the wiring connections for loose , frayed , damaged ,and corrosion the following link are some of the problems acossiated with your vehicle
Newest Problem Reports for the 1999 Mercedes Benz S320

Unfortunately most of the key fobs are badly built, right from the factory. 99% of the time the battery circuit board contacts in the fob get loose and the battery will only make intermittent contact so sometimes it works and sometimes it doesn't. You need to open the fob and closely inspect all the solder joints, any loose joints need to be re-soldered, the unit should then work fine.

PERHAPS THIS MODEL HAS AN ADD'L FUSE BOX UNDER REAR SEAT. WE DONT HAVE THAT MODEL IN USA

Is the fan blowing, do any of the knobs work ? Can you be more specific ?

Isn't there botton somewere on the door or left lower conner of dashboard to open trank remotely?

Turn signal switch.

Frist check your fuses,if good replace the burn out bulbs .

Just double check that you havent blown a fuse/or fuses, it may be that simple!

hello,hoping your 98 mb s320 is 140 model,try to check fuse in base module located at left side standing in front,remove 4 pcs.allen screw ,visual check your fuse,renew if needed,be sure you have freon gas in your system,if not corrected,send your car for proper diagnosing,ty