I currently have my vehicle's (Cadillac Escalade) charging system torn apart, and thought I would look to this group before I went ahead and started the rewiring process.
GM offers a dual battery upgrade package that wires the second battery in parallel to this first through the starter = both positives wire to the starter, both negatives wire to the chassis. There is no isolator or relay in the system. The factory type upgrade is standard in police vehicles, emergency vehicles, even some diesel trucks. Terrible sketch below:
The major issue with the GM wiring is it is 8 gauge at best, and will not support itself let alone a secod battery and an upgraded stereo.
Is there any reason why I could wire the system in 0ga. as per the image below utilizing the alternator positive as the common between the batteries and not the GM way?
I don't see an issue, thgough i don't know if an alternator will charge 2 directly wired batteries without complications. Does anyone have extensive DC electrical system experience that could offer information as to if this would or could work without an isolator?