Thanks for the info, Fonzi!

I was unaware that a 75 was supposed to be D-Jet. The more I get into this car, the more I think that someone has pieced it together. Oddly enough, it has K-Jet.

The fuel pump on the car is bad and the filler neck has trash in it. Power is disconnected to the pump and the fuel lines aren't attached at the engine - so no chance for trash to make its way into the injection system.

I'm giving power to the solenoid wire at the terminal block on the pass. side inner fender, so the wire running to the starter appears fine. Maybe this car shouldn't have that - but it does. No telling what the harness is out of. I also had to swap the alternator from the engine that came out of it in order to hook up the leads. The 80 engine had a 3-pin plug on connector whereas the one off of the car had a "typical" alternator setup; a hot lead and an exciter wire that bolt to it. The alternator is Bosch #AL69x, which from my research would've come on 82-91 380, 420, 500 and 560 SEL/SE/SEC's. It also requires a 3-bolt bracket as opposed to a 4 bolt.

As for the cranking issue, I'll probably wind up pulling the ignition switch and testing it since there doesn't appear to be a relay before the starter solenoid.

It's definitely a project, and its certainly never going to be perfect, but it should make a decent driver. I'm not daunted by it too much. These cars don't seem any more complicated than my Porsches aside from the fuel system. I have noticed that the distributor cap, vacuum switches, etc. are shared between the Mercedes and my 928's.