I'd like to add a 2nd battery to my boat in the nose for my stereo and ballast pumps, and think I have most of what I need to install it. The stock/starter battery is in the starboard rear locker, so there will be quite a distance between batteries. I don't know what size wires I'll need to run to connect the front battery to the battery switch, the starter battery to the battery switch and the switch to the starter. I've labelled those 1, 2 and 3 in the diagram. Since the run for #1 is probably about 20', I'd assume a fairly hefty set of wires would be needed?
Also, I'd really like to add a Battery Tender(or similar) to the HOUSE battery so it can get back up to speed while the boat sits overnight. I'm not much concerned with the starter battery since it will get the majority of the charging while I'm out. My question is would it be ok to leave my battery selector switch in position 1 while the battery tender is connected to the house battery, or will I have to switch it to OFF every time?
Finally, I'd love to know if there are any issues with my proposed setup! Thx in advance.
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