Hello,

I have a 76' W115/ OM617 300D.

After trips over 30 miles or so, the car doesn't start back up once it's been turned off. When I turn the key, absolutely nothing happens. I don't even hear a click. When the problem is occurring, I can get the car started by using a screw driver to complete the circuit between the two large terminals on the solenoid. I usually just need to arc it and then I can get in and start the car with the key. A couple of times, I've had to complete the circuit and start the car with the screwdriver, but that's only happened about 1/10 of the time.

My starter seems strong and the solenoid works fine when the car has sat overnight or after short trips. Like I said, when I turn the key after a long trip, I don't even hear a click.

Does this seem like a solenoid issue? Or could it be wiring? Maybe the sensor that senses when the car is in gear? what is that called anyway? What would be the best steps to take to troubleshoot?

I don't mind buying a new starter/ solenoid, but if it's something I can fix for a few bucks, that would be preferred.

Any help is appreciated!

Thanks!