Experience Swapping Battery Control Center Board?

Thanks for 2manytoyz for the write up too, I just clicked through to that. Before I replaced it with the Big Boy, my factory 200A solenoid was working but was buzzing like crazy at all hours on and off shore. I could wack the case and it would stop, but eventually come back. I never tore it down and it is still on my desk. It is much smaller then the Big Boy physically. The part number cross references primarily to an aviation part and they were all over $200, thus the Big Boy.