Temp gauge issue while braking

[volgapower]

I just noticed a new problem on my car.
while pushing the brake pedal, the temp gauge
begins to go down, even when not moving...
i think there is a ground problem
but where should i search this ground?

[Bluebimma]

Look in the fuse box, top right corner, theres likely a blown fuse in that sector.

[volgapower]

also found out that left tail light and brake lights no more burn... WTF?
also fuel gauge went mad
just before going to red zone the pointer jumped to 3/4 ...
is there any dashboard test mode as on E36s?

[KSKarl]

Check the fuse, like blue said, then grounds. Multi electrical problems always make me suspect a ground problem.

[Bluebimma]

Like i said, you blew the fuse up front. Your cause is the tail lights.

[volgapower]

thanks bluebimma
and how i find out what amper fuse i need for certain devices?

[cooljess76]

It should say on the inside of the fuse box cover, but it'll also say on the fuse itself.

[volgapower]

ok just understood how it is
the main problem to me is that
the layout is in german

[cooljess76]

You should get yourself a Bentley manual. Especially if you plan on taking on DIY projects and maintenance tasks. I think there's a pdf floating around the forum somewhere

[volgapower]

the link i found was out of date as it says

[volgapower]

the tail light fuse gets blown quite often, about every 100km.
even inserted yesterday 30Amp. fuse- did not help
i opened the panels and the bulbs had 2 contacts, are those correct bulbs?
how should i find out the closure? (is closure correct word?? )

[KSKarl]

Tail lights are single-filament bulbs - check the manual for correct number. Bulb should have a single center point contact on the bottom, and then the silver sleeve is the ground.
The brake lights are also single-element bulbs, but larger.

[volgapower]

sorry i meant brake lights fuse


the contact on the board is not in the centre...