I am planning on adding another battery so I have a dual battery setup, to handle a stereo upgrade. I think I have most of it figured out, but not sure how or where to ground the new second battery. Currently there is a very thick ground cable that looks to run back to the engine, I am guessing there must be a way I can use that somehow to ground the new battery.
Any suggestions or pictures would be great.
This is on a 2013 LSV.