On my GMT900 Yukon (a 2008 Denali), they were dual H6's - so I installed them without isolation and it works fine. I'd be curious to see how the new K2xx PPV's are set up.
I actually did some research here, it seems like the PPV's run mixed batteries in the newer models. I pulled the specifications from GM for the 2022 PPV's and it seems like they run a H7 primary with a H6 Auxiliary.
900 cold-cranking amps primary battery
760 cold-cranking amps auxiliary...
I agree that both batteries should match, in my 2008 Yukon, I used 2 H6 batteries connected in parallel - and that was fine. The issue here is that for some reason in the 2016 Yukon, the main battery is a H7, but the aux tray fits a H6 only (an H7 wouldn't fit, it is too wide for the tray).
In...
Thanks for the writeup! I'm planning to take on this project for my 2016 GMC Yukon Denali and I wanted to ask what battery you all used. I realized that my primary battery in the truck is a H7, and it looks like the Aux tray can only fit a H6 (I'm not sure if the part number provided earlier...
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