I have a 1981 w123 240d with manual transmission. I recently parked my car and when I came back after a few hours and turned the key to the start position. Nothing happened. The starter motor didn't spin and the the solenoid didn't click. The battery seemed to be charged and the instrument lights were on.I went to the starter and bridged the connections for the starter motor and the solenoid with a wrench. There were a few small sparks but nothing else. Not like the sparks you usually get when you do this. I was on a hill and started the car by rolling down the hill and popping the clutch. I drove home and the idiot lights were off and the alternator seemed to be charging. When I got home I killed the engine, I tried to restart and it started and restarted in the usual way several times. I went back to the starter and bridged the solenoid and starter motor connections as before. This time the starter motor spun but didn't engage the fly wheel. The solenoid didn't throw. Do solenoids sometimes work intermittently or do they just go completely dead? Thanks for any advice.