Having a strange issue with my 1984 300D with a 4 speed manual swap. I did a manual crank window conversion on the car, and afterward drove the car with no issue to oreilly. Car started fine and drove fine with no issues. When I go to leave the store, the car would not crank whatsoever. Turn the key to run with no response. When the key is turned back to the off position and removed, all of the lights on the instrument cluster remain on; blinker lights, battery light, brake pad wear light, seatbelt light. Have to remove battery cable to get them to turn off. The only change is when the key is turned from "off" to "run", the battery light turns off, and when switched back to "off" the light comes back on.

I figured it may be an issue with the ignition switch, so i installed a brand new one from Mercedes and the issue still remains. I've checked over the wiring and do not see anything out of place. Fuses all check out too. Battery also checks out. The ignition assembly itself appeared to also be in good shape, the wings on the back side were intact and it functioned fine. Again, the car makes not attempt to crank whatsoever. Pop started it to get home and has sat since.

Any help on where to look or how to go about this would be greatly appreciated!