Re: Clicking Relay ??
The observed clicking noise is the Automatic Charging Relay (ACR) (aka, battery separator). This is the magnetic latch closing or opening. There are several conditions that automatically invoke this function to join or separate the house and starting battery banks. Some conditions include timed delay while others are based on your actions (e.g., pressing the remote start button for manual jump start from the house battery). I'm new to this equipment, but my BlueSea ACR is closing (I can hear the click when it does so) seconds after engine start-up following storage without shore power hook-up, and again shortly after engine shutdown. I believe it is because the voltage levels the ACR is monitoring are in the range for automatic switch closure via the relay in order to support alternator charging and then switch opening once voltage readings come down sufficiently to indicate a charging source is no longer available.
2010 Ford E250 5.4L V8 Gas 2WD
SMB Mod RB36 w/PH Prop Stove & Furn Frig 10G Wtr Elect