[FrankM_]

Looks like you have a wiring issue in your headlamp then ? I also had a confusing situation with the blinker like that (US car = M553 variant) as this blinker has a dual-filament lamp and also doubles as a 'side light' of sorts. So if your bulb isn't fitted exactly like it should, the second filament can make the blinker 'always on'. Or in my case it was some strange wiring the PO did in the headlight.
Since it is illegal to have a permanent orange light here (Belgium, Europe), I disconnected the 'sidelight' power feed in the headlights and spliced the blinker power feed so my sidelights don't come on, but act as a side blinker instead.
Check the '88 schema above and you will understand, the two X's in the blinker mean that the blinker light has 2 filaments.


On the drain, I guess you mean a 6 Amps drain with an AMP meter connected in series between BAT- and a ground point ? (Given battery ground strap is disconnected ?) If you just connect an Amp meter in parallel to the ground strap I am not sure what you are measuring.

On the potential 6amps power drain : if you say that you pulled ALL the fuses at the same time (also in the engine compartment - there are 3 fuses there ?) and it still pulls 6Amps - it can only be some of the unfused circuits.

With the diagram you can trace these unfused circuits from the battery on 'Blatt 6', coordinates F49.
From the + terminal :
- thick black wire to the starter, connected from there to the alternator (B+) and from there to some other circuits. (You can easily disconnect this wire from the + terminal and remeasure)
- double red wire (2x4 mm2) to terminal 30 of the key contact switch and from there single wire to terminal 30 of the light switch unfused
- 6 mm2 red wire to DME relay under the driver's seat powering the DME but also the injector circuit and the O2 sensor heater and the ICV, all unfused (through connection point 2 on the diagram).
These circuits are activated when the DME relay switches them on.
Fuel pump runs over fuse.
- From the light switch the interior lights are fed (black/blue wire) but are UNFUSED ! (real hazard) You should put in a 3A fuse locally (between terminal 58 of the light switch and the black/blue wires)

Check all these points (or disconnect their wires from the + terminal of the battery) to discover in which circuit the unfused load sits that draws 6A.