My 1975 450SL is breing difficult. a couple days ago.. I thought it was the battery or alternator .. because it ran fine.. but after driving for a while, if I turned it off.. I needed a jump start. I charged the battery a couple times to avoid this.. and it was fine for a while. Now, I left the charger on the battery for 2 nights and I think it's fully charged .. and nothing... but the rest of the electric works.. brake lights, radio, buzzer, dash lights...

Starter will click sometimes.. and nothing others...

I even tried jumping it.. and nothing..

Is it the Starter???

Please Help!

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James P