Good idea.. I'll try that tomorrow.. Thanks for the help.
If the PC runs ok and does not immediately power down when the motor is shut down then you know for sure that it’s the control line that is the source of the problem. At Least you then have a place to start.
Yes, it's not the ideal way to do it because it may be a combination of the power down signal and the engine shutdown, but the idea is to see if the cause of the sudden PC switch off is that control line or some other connection to the PC/PSU. Then a more correct test can be carried out.
It began the hibernation process.. While it was still in the process I turned off the car.. It didn't shut down and continued hibernating correctly..
So, it has to be something going on with the IGN wire only when the car is shut off because it works fine when I manually remove the IGN wire from the M2..
How can I fix this?
Just one more test, this time don’t set the PC to hibernate, just cut the ignition. Want to make sure the PC keeps running fine.
Ok, so you have now eliminated the rest of the installation and were down to something going on with the PSU control line.
Now there are elegant solutions to the problem BUT for now we want to keep it SIMPLE and almost NO COST until were 100% sure we have a fix.
So, with that in mind you could try a couple of quick fixes.
1. Try a quick filter on the control line.
Go to an electrical hobby store and buy a 47ohm ½ or 1 watt resistor and a 10uf 25 volt electrolytic cap. Place the resistor in line with the control line, mount it near the PSU, and then connect the (+) side of the cap from the PSU side of the resistor and the (–) side of the cap to a ground point on the PSU. See if it solves the problem.
2. Solution two.
Get a very small 12v relay. Power the relay coil from the IGN wire. Connect one of the relay “normally open” contacts to the PSU control line and the other to the “always on” 12v line going to the PSU. This “almost” completely isolates the IGN wire from the PSU control line.
Once again NO guarantee that this will work first time, but I am pretty sure we can get it to work one way or another. Again the point of the exercise is not to get technically cute, just to get it working first.
Yep, I mentioned that earlier, didn’t know if you had one though. That is most likely just a DC filter; connect it the same way, between the IGN and the PSU control line. He may have used his in a different location but we know that your problem appears to be coming down the control line. The filter I described will de-bounce the ignition line a lot more, but that should not be the problem anyway.