I have an Orange Micro Crush CR3 and a Marshall Jackhammer pedal. Both will run on either batteries or DC power. Here's my issue.
Both devices run perfectly on battery power, the second I plug in a DC power supply, they switch off, even when the other end isn't in the wall, so the act of just plugging something in cuts the power.
I have tried with and without battery power, I have tried 5 power supplies. I know the Amp and Pedal work perfectly, my jack leads work perfectly, the power supplies work perfectly, one of them is for my Yamaha Keyboard so I'm certain it works, and before anyone asks, yes the power supply matches exactly what the devices require (12v - 500MA DC). I'm at a loss, there's no switches to change from battery to outlet so I really don't know. Anyone have any idea? It's such a strange problem