Thanks Clement, I think you are right because issue occurs intermittently, so I will check tomorrow... Br
F.

Thanks, I did and was surprised but the regulator ( and alternator) are working fine...

Thanks cn, so see you in Toulouse next time
I found x3 30 amps relay in my mess to replace the faulty J ones, looks like OK now, just the abs is still not working despite motor cable replacement.
BR
F.

Thanks to Misha as well

Hi,
Cn, Erik & a abscate, thanks lot for your replies and information, I removed then tests the 3 j relays, all are faulty, it seems the diodes are deads. I replaced the j by straps then all light on the pannel board were on again and I was able to start the engine... So thanks again, I found some ...

Dear all,
Il have one 850 from 1996, unfortunately the battery polarity was crossed... So the car does not start anymore... I have checked all fuses, all are OK, but no indication on the board panel (all lights are off) I heard the issue could be the ecu? But how I can be sure? Do you know if this ...