I do not have your make and model but I suspect it's VIN specific.. Some start of f the house. some the chassis and a very few have a dedicated generator battery.
Today's job.. >Car did not start on its own Wed so had to have park jump it. Jump pack I have.. Well toast.. So today I got new jump pack (Harbor Freight has 'em on sale) then I started checking house batteries .. The twins look ok and once I cleaned the terminals took a charge nicely... They were not thirsty (As anticipated)
The triplets (3 12 volt in parallell) not so good. One (First one) Failed the STATIC test.. Not enough voltage
The 2nd passed with flying color (Green) (load test is 350 amps for 15 seconds actually for a Group 29 that's a bit much)
So one new 31 in position 3
THe one that passed in Position 2
THe one that did not in my car
I'll get a new one tonmorrow and then put the ne (also a 31) in position 2 and the good 29 in position 1 (Easiest to replace)
the third failed the load test (300 amps it could not deliver)