2015 GMC Sierra Bolt Size for ground on 3 battery bank setup

MGnoob · August 18, 2016

Greetings, can anyone identify what thread bolt i need to use this hole on my engine block for ground?also i would like to know what size the ones just around the corner are incase i want to use thatone to get away from the heat of the exhaust.

Im sure i'll have a couple more questions before this project is over.

Here's alittle backround..i just had a leer cap,Kargomaster ladder rack, and Curt front mount receiver installed.Im installing 4 52" lightbars, a 190 amp 3 battery bank isolator,Zeon 12 premium winch.

Ill also be cutting the blue wire on my backup camera, wiring in a diode, and a second power source on a switch so i can use the camera as a rear view mirror without my reverse lights coming on.On the front and rear of my vehicle i will have 1 350amp winch quick connect, 1 175 amp battery charge/jump quick connect, and remote battery terminals for jumping charging with battery charger. I went with 4/0 for the winch and the long run and 1 gauge for everything else..i could have gotten away with one gauge everywhere but didn't plan on having batteries ib the rear of the truck very often.

Most of my stuff has shown up but now i am waiting for the dealership to order and replace my receiver do to recall. They also shafted me $170 for a key and FOB...then $20 to look up key code, then when i went to pick it up they wanted $50 to program the FOB..very rude and total BS. Had they been upfront about the extre fees i would have just went aftermarket when i install the remote start i ordered.

Edit.... the small one around the corner is the same as the battery hold down bolt so i can match that up, but its alittle small and doesnt have the surface area i was hoping for so if you know what size the one in the photo is help me out please.

MGnoob · August 18, 2016

Photo of my truck...36"leer, kargomaster with 6" leg extensions... had to be cut and welded 6" higher to fit.

Pile of parts.....connectors, lugs and hydraulic crimper should be here today.

Im using Dorma replacement battery hold downs.. there in the photo on to of the battery.ill be using 3/8 ss threaded rod, washers, nuts, and wingnuts to secure it to the spare battery tray. The tray has no threaded holes or hold downs so ive got 3/8 rivit nuts. I have a 12x12x3/8 thick aluminium plate that will bolt down over this and be a place to mount the electrical components.

I hate drilling holes in my dash so ill only have 2... camera override, master power for wireless unit for the 4 lights.

I tried several bolts in that hole and haven't found the right one... ive pulled others from other spots on the truck to try.. a pretty silly dilemma considering everything else ill be doing.

Photos to big ...im working on it

MGnoob · August 23, 2016

Made some progress. Trying to stuff alot of stuff in a small spot.

Had to rotate one of the battery hold doen blocks to get thing to fit right.Mounting the isolater underneath the aluminium plate, now i won't need a bunch of fat wire running from ontop to underneath.

Its a work in progress. I want the bracket back in the truck but i didnt get the rivet nuts the way i wanted them without the tool. So im waiting on that tool now.winch will be here tommarrow, had to return my lightbar bracket they where the wrong size.

I might install a 3rd or 4th threaded rod if the plate wants to move around. But seems solid enough..got to wait till its in the truck again to tell for sure.

Anyone know the thread of that bolt hole in the first post.?