OK! So after a bad accident in my Mercedes a couple weeks back I bought a new one, the criegslist ad said, use to start and drive perfect and won't start anymore (or very intermittently), I drove up, swapped the battery (wasn't the problem), tried turning the key on and off repeatedly and eventually after messing with the fuses and about 100 on/off cycles of the key, the glow plug light randomly came on and the car fired up in 20 degree weather. It ran great, drove it around the parking lot, parked, turned it on and off 5 times, glow plug light came on every time and started without issue. So I bought it. Came back to pick it up and again it wouldn't start, no glow plug light and I haven't gotten it to start since. The only upgrade the car has is something called a "Stage 2 chip" but otherwise is stock. I've scoured the internet looking for everything that could have to do with this problem and came up with alot of good options, but all have failed so far.

First I swapped the K-40, no change, then I swapped the Glow plug relay, no change, then I tested every wire and the ground to the glow plugs, all good, then I tested the glow plugs, they were all bad (odd because it fired up so well in 20 degree weather which should be impossible) but today thinking that had to be the problem, I swapped all the glow plugs and still absolutely nothing. I turn the key over, the k-40 clicks, everything seems function properly but it refuses to even crank.

The work around I found was that if you bridge the connection on the K-40 the car will attempt to crank as soon as you turn the key to the on position, but no matter weather I heat the engine or use ether ect, the car refuses to fire. At this point i'm completely lost, as a last ditch effort I will be swapping the Ignition and ECU from my parts car hoping that maybe the "Stage 2" messed up the computer or that the ignition is somehow faulty (which I see as highly unlikely) but any other opinions would be vastly appreciated!