Thanks for a teriffic install article. I have a 2004 AVA 1500 4x4 W/F/B/C. I am running some rather heavy draws on the main Optima battery and now I can redirect these draws to the second Optima battery (I intend to use their Marine Blue top battery v the standard Yellow or Red Top. The Blue has a bit more staying power than the other two, I think. At any rate, thank you for your effort. astew20660@aol.com