I have a 2005 mercedes c230 kompressor and i want to know if there is any way to check the alternator without a voltmeter.

not necessarily
when diesels knock and diesel at low rpms it generally indicates a dribbling or leaking injector/s
have an accredited diesel repair shop check it out
If it has some miles on it and the injectors have never been done then the injectors are a fair bet

lose wireing or old relays

if it was fitted by garage take it back if not make sure that the wiring loomb that goes into alternator is pushed in all the way and no wires are loose

- Check the wiring harness for proper connections.
- Check for short circuits.

the w202 has stick needles on the clocks i have tryed all sorts to try and stop this the latest thing is i took the clock out and scraped the paint off the pins the needles rest on and touch wood its been ok its got somthing to do with a static build up and the needles stick so there like a magnet or so my merc deler told me

check your volt gauge on the dash. if it's working properly, then your car is throwing a bad code. if the battery looks as though it's taking more than 14 volts, or less than 10, you have a problem.

Hello,
From the below link you can download the manual.
http://pdfservicemanual.com/automotive/2005-mercedes-benz-c-class-operators-manual-c230-kompressor-c240-4matic-c320-4matic-sport-c55-amg

I hope it helps.
Thanks

yes

Battery not charging .. chech ur alternator

try the door module. get the one from the driver side and try it on the passenger side . most common problem on mercedes