Thanks to all who responded and I greatly appreciate the feedback and recommendations. To be honest I researched the Digikeijs DR5000 and DR5033s, I did not find any information stating that it was not advisable to power all components with a single power supply with the recommended voltage and amps, so I figured this was not going to be a problem. I will say I ran the DR5000/DR5033 setup with this single power supply without any issues, it wasn't until I upgraded with the YD9401 this issue began, so was not sure what I may have missed or configured incorrectly.
**If Jim has automatic polarity reversal turned off? on the DR5033s as recommended.
I have not configured any DR5033 other than giving them a module address. And as I am really new to using this system, wasn't aware that the recommended setting for these was to turn automatic polarity reversal turned off and to be honest not sure how to do this as well.
**For YaMoRC devices with HBridge it is not !! Every HBridge needs it's own double Isolated Switch-Mode powersupply. !!!??
You mention this is recommened for YaMoRC devices, so is that true for the DR5033 as well?
**Having a power supply drop from 18v to 8v at switch-on is alarming and does indicate a permanent low resistance somewhere.
This only happened once and it happened when I turned on track power. Also i removed all my sound locomotives from one of the blocks and the problem cleared itself.
Sorry for not using the "Blockquote" feature, but I could not get it to work in for me. It kept wanting to quote very thing I had typed....LOL