07-23-2014, 06:36 AM
Below is a photo of a Echo-charge by Heart Interface that is similar to the one Forest posted about. It uses a small amount of current from the house batteries (which are charged when plugged in) to keep the chassis batteries charged (which are not charged when plugged in). Thus the merge switch being left on is avoided along with the limited risk of the house batteries dragging down the chassis batteries.
2001 Newell #579
tow a Honda Odyssey
fun car: 1935 Mercedes 500K replica