Ok...I powered up without driver board. I had hoped this would close the protection relay. Sadly it didn`t. This must mean that the problem is somewhere in the protection circuit and not the driver board(previously tested in another unit). IF everything is a-okay, shouldnt the relay click without the driver board installed? I have read this on a couple of threads here on AK. Please confirm......thanks. Just for info....the outputs are brand new and tested mj21193\21194`s. I have a feeling its some small friggin diode or resistor messing things up......any ideas?