My 99 clk 320 v6 3.2L w208 will not crank or start

Could even be bad brushes in the starter....still getting power to everything else? Or maybe dead battery?

Have you replaced anything trying to fix it?

I got new group 49 battery and starter .

Find a nonessential relay that you can swap out for starter relay to use as a test

Just had to replace it in our grand caravan because it was doing the same thing (intermittently), replaced the battery yesterday (it finally wore out), went to start it and it went click, tried again and it started. Drove it to the parts store tested starter and alternator, both passed. Got to thinking about last time it didn't want to start (ticking in engine compartment fuse box after turning the key back to off but couldn't track it down. Replaced the starter relay and haven't had an issue yet (only been about 5 hours though)