I am currently in the latter stages of my first build and am having some trouble with a Mini BMS system that I purchased form Clean Power Auto. I have 38 3.2V cells in my system and am controlling an elcon 2500 charger with a relay that was also provided by Clean Power. I realize now that the charger has a DIN connector for a bms but I used the relay anyway and just shorted the two DIN leads. For a while the system was working fine. I completed my first full charge a few weeks ago and few small "top-ups" after having driven around on my property. This weekend I dis-connected my battery pack to re-locate a shunt due to the fact that an ev-display was not working properly. After I re-connected things, the display seems to be working but I cannot charge for more than 30 seconds before it stops. I know that my cells are not that full (i.e. I expect they could use about an hour charge). The relay is opening and the red light that is usually on turns off. After I re-connect my 12 V, the light turns on again. I have also tried cycling the ignition and then re-charging and it sill shuts off after 30 seconds or so. Any ideas? To be honest, I had this issue a while ago before completing my first full charge. I don't really think I did anything to solve the problem. It just went away. Also , I checked the grounds. They seem good.