Replaced dead battery....stereo won't work.

Here's the link and I'm sure you will get the solution of your problem
MERCEDES BENZ SLK SERVICE REPAIR MANUAL 1998 2004 DOWNLOAD

Have you cleaned and lubed the spring?

Check the fuse link.

the blend door needs repair--need a teardown manual for that mercedes--can be a job even for pros

the release is under the dash for the main lock the safety is by the rt oor left headlight

Car Radio Battery Constant 12v+ Wire: Red/Green
Car Radio Accessory Switched 12v+ Wire: Pink/Yellow/Green
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: Gray/Blue
Car Stereo Antenna Trigger Wire: Blue/White
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: Under right footwell carpet.
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Blue
Left Front Speaker Negative Wire (-): Blue/Brown
Right Front Speaker Positive Wire (+): Yellow
Right Front Speaker Negative Wire (-): Yellow/Brown
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): N/A
Left Rear Speaker Negative Wire (-): N/A
Right Rear Speaker Positive Wire (+): N/A
Right Rear Speaker Negative Wire (-): N/A

pls rate

Check one of the fuses in the bonnet. There is most likely an electrical contact problem. You will need a fuse wire replacement

first thing I would try, disconnect the battery to the car for a minute, then reconnect it. that may correct your problem.

hello,good day,try to check your number 14, for your left and rigth speaker amplifier control module,also try to check the fuse in your amplifier,ty

19.8 volts is too high. the alt regulator is not working. The regulator needs a battery source feed to work. Both the feed for the regulator and the connection between the output post and the positive battery terminal should go through an ALT fuse. Start by checking that.