RobSparre
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Hey G - 12ga is almost certainly fine for everything if you want to keep everything the same. As john mentioned in his reply it all depends on current draw, voltage, and length of run and he provided a link to a wire size calculator. I bought a 5 pack of relays for general use from Amzaon - here is the link.Rob,
Yes I would think that would work just fine! A couple more questions as I am supposed to be taking delivery today on most of the components for this dual battery set up this week.
Are 12v Relays pretty standard? Wondering where you purchased those and the specifics on wiring through them, is it best practice to run all accessories through a relay? I assume 12ga wire is sufficient for all this wiring if I wanted to use one gage for all the wiring?
No need for a relay for everything. It just adds a lot of wiring and clutter if you don't need it. The relay's main job is to have a low current circuit (like at the switch) trigger a high current circuit. Most accessories don't need it, such as dome lights, LED rear lights, USB charger. Many accessories that need a relay come with the relay - so you probably don't even need to buy one.
I made a video for "10 Accessories" that include a number of additional lights and circuits showing which ones used relays, etc in case you want to check that out.