Car has been working nicely the whole winter until I put the missing radio back on a week back. I had to remove the boost gauge for that and the gauge lamp caused a short to blow a fuse. It could be totally irrelevant for the problem at hand. Then this tuesday morning apparently the installed radio caused the old battery to die which I replaced for a new one. But after the battery replacement the ABS -system stopped working and the warning light stays on. A while back there was an occasion where the alternator and ABS -warning lights didn't go off but that problem had fixed itself the following morning. I checked the fuse beside the power block in drivers side strut but it was okay. I also measured the charging voltage which shows a healthy 14 volts.