Date registered: Nov 2013
Vehicle: MY05 CLK55 AMG , MY05 CLK320,Former,C180 Kompressor,Jensen Healey,Ford Capri V6,Alfa GTV.
Location: Australia's East Coast
Mentioned: 3 Post(s)
Quoted: 299 Post(s)
$1100 is a lot for an alternator replacement ,,,should be about half that...at the most.
Your car's alternator should be putting out over 14v when idling ,,,,have it tested elsewhere if you can't do it..
There is a menu on the dash where you can see the voltage,,
Turn to ignition ,,press trip button three times,,,then use steering wheel buttons.
I wouldn't replace it unless it was not putting out correct voltage ,,or was making a big noise all the time.
Put a long screw driver to your ear and touch the part with the end and you will hear the noise better.