Remy27

I ended up using one of the free spots on the battery distribution block and a Wirthco Battery Isolator for my dual battery setup. (https://www.amazon.com/gp/product/B0058SGDFK/ref=ppx_yo_dt_b_asin_title_o08__o00_s00?ie=UTF8&psc=1) Be careful with the distribution block, make sure you have it disconnected from the battery. I forgot this step and fried the fuse to the starter and ended up having to replace the whole block.

Makes sense. That's what I get for being a good samaritan! Again not the best design. Isn't one of the purposes of a fuse to be able to save the equipment and be easily replaced? Seems like a design flaw.

Not sure if this will help anyone, but In my old 08 Sierra I installed a second battery with a Cole Hersee isolator. I also was able to get relatively cheap 1/0 cable and terminals from the local Airgas welding supply store. They are made for welding, but are much better and cheaper then most automotive cables (also had to buy a special terminal crimper.) I mounted my inverter under my driver side rear seat. There's a spot near it under the carpet where you can easily drill a hole and use a grommet to protect the cables. I also ran a waterproof heavy duty cord in to the bed of the truck. Worked really slick. Was able to run a TV, stereo and lights for about 4 Hrs without having to start the truck back up. With the truck running I could and did actually run a sawzall! In all I probably spent $800 for everything including the optima yellow top battery. I may put it in the new truck but haven't gotten around to it yet. Hope this helps.

They said towing would be covered as long as the replacement was deemed under warranty. However I just moved both lines to the 3rd post, which is a 125A fuse as opposed to the 175A it was originally on. Temporary fix to drive it to the dealer. To be honest I think I blew the fuse when I helped my neighbor jump his car. He removed his side before I was ale to remove mine and then accidentally touched the two terminals together. I havent used the truck since that day so it didn't occur to me till now.

I did a continuity test on it. Looks like you were right, the fuse was blown on the 1st post. The ridiculous part is that I will have to get it towed to the dealership in order to be covered under warranty. Definitely a design flaw if you ask me. The battery has power and the engine runs, so this one fuse can leave you stranded. Good thing I was home when it happened. Thanks again for your help!

I'll check it out when I get home. Thanks for the help! I appreciate it.

How will I know if its blown? It doesn't look like it has looking from the top of the box.

Went to start the truck today and when I turn the key I get nothing. Dash and radio don't light up. Checked all the fuses and relays that I thought might be applicable, but everything looks fine. Battery has a full charge, Interior lights work, but the passenger side headlight doesn't come on and the driver's side turn signal doesn't blink when locking and unlocking the truck. Anyone heard of this issue before? I have a 2016 Sierra 1500 5.3L Z71 with 10,000 miles. Haven't had any issues until now.