Okay, been reading around on the forums and I'm really impressed with some of the information found on here so I decided to make an account and chime in. I'm just gonna throw out my situation and what I've got going on and hopefully I can get some good advice and tips from you guys.
I have a 2014 GMC Sierra 1500, 5.3, single cab SWB, base model pickup with all the basic features, nothing crazy.
I'm trying to install a dual battery setup. its going to have a simple battery isolator, the large relay or continuous solenoid style. That will power on with the ignition, or preferably when the engine is running. Allowing the two batteries to be split while the truck isn't running.
For the Isolator ill be using a 500 amp continuous working load relay, in hopes that the extra beefiness will help increase longevity of the unit, overbuilt is always better right?
unless you guys say otherwise. ill also be using another of these isolators for the winch power cutoff that ill be installing aswell.
for the aux battery ill be going with a second starter battery matching the main battery, after reading a few very lengthy posts arguing about deep cycle vs starter battery's vs only using single battery's etc,etc,etc.... I've decided that for the amount of time that ill be using the winch a second starter batt will be sufficient. seeing as a big part of the reason for adding a dual battery is to help with cold starting since ill be relocating to Wyoming within the next 6 months. much colder there than we see in Oklahoma from what I've heard..
I've made up a quick diagram of what the wiring will look like in Microsoft paint, excuse the crudeness of it. it should explain it pretty well I hope. I've also included a screenshot of the "current draw sensor". I couldn't actually find a lot on this, most posts ignore that its there and some say you MUST run your aux battery's ground through that sensor, top to bottom, and then connect it to the block or frame. some also state that it can be connected directly to the main battery ground terminal for the same effect. however wouldn't that cause double the current load through that factory ground lead?
after all my reading on the forums I've decided that this setup should do a decent job. however id really like if I could hear some other peoples 2 cents on the whole thing. also with the battery isolator, is there a terminal in the fuse box that will get power only when the engine is running? is that a thing on these newer engines? do they only have Ignition key hot terminals? I know if it was a small block 350 I could just tap into the low oil pressure dummy light. so surely with all of these electronics they would have a something similar to that, id think anyways.
so to sum it up my main questions are: Is running the aux battery ground through the current draw sensor the proper way to let the computer "recognize" the battery and adjust the charging rate? and then, is there a fuse or terminal to tap into in the fuse box that only has power when the engine is actually running?
lastly id just be happy to hear yalls input and opinions on this setup.
current draw sensor