I was putting a replacement alternator on my 1988 190E 2.3 and I did not disconnect the battery first.....In the process of putting the plug into the back of the replacement alternator, the orientation was off and it arched briefly. I disconnected the batery and finished the repair but now all the warning lights on the dash are illuminated. Did I make matters worse or can I easily fix this screw up...I'd apprechiate any advice
Thanks
Tom