Our Hunter 290 has a second battery bank that consists of two Group 27 AGM batteries. WHen the boat was commissioned they put the extra batteries under the starboard settee. Created a pretty good list. so we are moving them to the port side settee. In doing so, we are going to also install a Link 20, and seperate 1/2/Both switch to allow us to seperately select each battery in the second bank. Ordinarily this would be on both putting those batteries in parellel. The common post on the switch would then run to the 2nd battery post on the primary switch allowing it to combine with the starter battery. My plan is to run the negative cable from ships ground to the Link 20 thing (forget what it is called). Then off that to each battery bank ground but putting the house bank through a 200 amp (or so) fuse. My question is....if both switches are on both..the most common position ( and the one that allows the alternator to recharge everything) when the starter is engaged will the starter draw cause the fuse on the house bank to blow? I prefer having the fuse because the run from the starboard side to the port side is going to produce cables of about 6-8 feet long and I want to make sure that the system is as protected as possible. Most diagrams I've seen put the fuse in the negative cable. I know that I could get a different primary battery switch (Blue Seas) that seperates the engine start from the house side, but this boat is in a charter fleet and they prefer to keep it as near Hunter simple as possible. So I'm looking for the safest compromise. Beyond that, this forum has been extremely helpful to us as we have waited for delivery, shopped for options, and outfitted this new boat. We appreciate that it exists and that you all participate to make it work. We look forward to meeting some of you local bay area owners in the near future. Thanks, Adrianne and Dan (S/V Feije)