Mike, electronics is not my area of expertise however from all the 12volt printed circuit boards that I have had to change, most came with a 2amp up to 5amp ATC fuse. Examples would be an Atwood water heater, furnace, dometic & norcold refers and air conditioners. I am not a big fan of re-engineering someone else's product and I have no idea what kind of power it takes to drive data from one source to another. I guess a 2amp fuse would work? I need more qualified feed-back. Fred