This may seem like a stupid question, but I just finished installing my second battery and blue sea ML-ACR in my 4runner. I didn't install the supplied contra switch because I can't think of a time when it would be a benefit to isolate the batteries or combine them via a remote switch. Honestly I hope to forget this system even exists while it runs in the background and if I'm winching or need to jump myself I can manually lock them together by turning the knob under the hood.
Is there some use I'm missing?
Is there some use I'm missing?