Passing on some info about second battery option.

[CT Chevy Connoisseur]

Question - I am connecting a 12 gang Auxbeam panel to my truck - was thinking about connecting it to the factory auxiliary battery.  Would this be okay?  Panel will house air horn, compressor, bar light, and fog lights at least.  

Auxiliary battery is in a better spot closer to where I will have to mount the panel as well as easy access to the fuse panel foe the acc connection.

[Gary2500LTZ]

So just to clarify, on a gasser,  can the upfitter switches be connected to the auxiliary battery, or do they need to run off of the main battery?  

[64BAwagon]

My guess would be main battery since I dont think GM would have 2 different harnesses for the power, although I think it could be easily routed to the 2nd battery and would make more sense there. 

Edited June 14, 2025 by 64BAwagon

[Another JR]

Functionally connecting to either battery would work. On a gas truck connecting to the aux battery would prevent you from running down the start/main battery. The fuse and bus bar pieces in the kit are designed for the main battery.