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GOOD ADVISE--I ALSO LEARNED THAT THERE MAY BE FUSES IN UNDER THE HOOD ALSO. FOUND OUT TODAY THAT IF THE DOME LIGHT DON'T WORK THEN IT'S FUSE COULD BE BLOWN AND HINDER THE CIRCUIT TOO. I'M NOT GOOD ON VOLTAGE READING , BUT DO HAVE A TEST LIGHT. IF NO FIRE AT THE COMMON TAIL LIGT-DASH LIGHT FUSE , THEN THAT MIGHT NARROW IT DOWN. I HAD THE SAME TROUBLE IN MY 1990 FORD XLT LARIAT AND WAS BLOWING THE TAILLIGHT FUSE. IT WAS A SHORT IN THE EXTERNAL TRAILER KIT HARNESS WHICH CAUSED FUSES TO BLOW REGUARLY. WHERE IS RELAY FOR TAILIGHTS AND OTHER FUSES UNDER THE HOOD??
The dim ones are the parklights..........just a few questions first before diagnosing......when you put the switch to dim...you have no lights on ???? is the back lights on, number plate lights ??????..if not, could be the fuse blown for that cicuit......or get this....2 x blown globes...i have had this before......both globes dont work, and i diagnose for 2 hours, and find that I have both globes blown....because 1 globe does 2 circuits, the bright ones could work, but the parklights fail.......
If you haven't identified the cause of the temporary short circuit or overload there is a very good chance it will recur.
Check for chafed or cut insulation on parklight wiring, particuarly around the lampsocket area.
Check for water /corrosion within parklight lamp sockets.
Check for possible problems on any wiring to towbar connection (if fitted).
Check parklight circuit connection to any aftermarket alarm system fitted
According to the BMW manual circuit diagram F33 feeds power through the parklight 'on' switch to left front parklight and left tail lights (all grey/violet wire).
Suggest you remove all left side parklight bulbs, then check fuse does not blow.
If it blows without bulbs installed, check wiring/lamp sockets for short to earth.
Instal one bulb at a time, checking fuse status each time.
Perhaps spurious alarm problem is related to faulty alarm wiring- especially if the alarm is an aftermarket installation. Check quality of any spliced joints to the parklight circuit for possible shorts or water ingress.