I'm not an electrical expert by any means, so bear with me here. Through some reading, testing and experiments, I've learned that the EHX Bass Micro Synthesizer: Has a 2.5mm DC jack, instead of the usual 2.1mm Is wired to be center-positive at the jack, instead of the usual center-negative Seems to run just fine at 18VDC I've recently replaced the original DC jack with a new one that's 2.1mm, and I've wired it to be center-negative. I tested it out, and everything powered up fine, and using just my bass and a computer, the effect works fine. Now, here comes the weird part. I plugged it in with the rest of my effects on my pedalboard, plugged it into my Dunlop DC Brick with everything else, and it wouldn't power up. I tried it at 18VDC using an 18VDC output on the Brick - nothing. I tried it on 24VDC using a 9VDC outlet and my Godlyke Power Pump - still nothing. But my other effects powered just fine... I decided to unplug the patch cables from my BMS, and voila - the light came on! I plugged one cable back in, and the power to the BMS was knocked dead again. I unplugged it and tried the other one in the other jack - same thing. So, here's what I'm seeing so far: The BMS powers just fine by itself, and works when used by itself (no other effects in the chain) All effects power up with the Brick as long as the BMS is not in the effects chain The power to the BMS is cut off as soon as a patch cable is plugged in to either jack (input or output) The temporary replacement jack I installed is an all-metal panel mount type - the original was plastic. I have a plastic one coming this week, but the all-metal one was temporary. I covered the chassis that would come in contact with that jack with electrical tape as a precaution, so there's no contact of any kind at that point (at least, I hope not). The input and output jacks are wired together for grounding purposes, as they're both linked to the gray ground wire you see in the photo. That wire goes to the chassis. I haven't changed any wiring other than what goes on at the DC jack and the LED; all the other wiring is intact. The LED wiring has never been an issue - I changed it to a blue LED months ago. What might be going wrong? Why does it work by itself perfectly fine, and power with all the other effects when it's not in the chain? Why does it not receive power when it is in the chain? Is it my DC jack? Is it the grounding? Is it something else altogether? Is it something I can change? It's all yours, TB - see if you can solve my little dilemma so I don't have to go back to a wall wart!