If they are both under warranty - get them to check them - you definately have no output from the alternator circuit. Before you condemn them though - I had one case where the lead from the alternator to the battery was burnt open. Check the voltage output at the back of the alternator first - if it is 14V or so - then follow the wire back to the battery to find the open. If it is still 11.8V at the alternator then have them check the reg. and alt. under warranty.