This layout (assuming the relay has a 5th pole to as a common between the 2 batteries so the switch over is "car batt to 5th" then "aux batt to 5th", however this design will result in the AUX batt never being charged.
If it was me i would permanently wire the AUX to the system and then relay the car batt to turn it OFF when the ignition is OFF, this way both are used when driving (and means both charging) then only 1 (AUX) is on when not, as the relay would disconnect the main battery.
Many Thanks
Quote:
Originally Posted by technobill  I have a 2005 EscaladeESV and would like to add a second battery. Is the physical space proximal to the firewall on the passenger side substantially greater in the '07s and following than previous generation Escalades? My concern is less with wiring specifics and more with obtaining a 'mounting tray' and brackets to secure an Optima Yellow Top. I've plans for using the deep cycle Yellow Top in isolation from the main battery while using the ESV as a "Motor Home" i.e. parked overnight with separately powered auxilliary internal illumination. Am considering using the following to isolate the secondary battery while the engine is off, thus keeping the main battery untouched: http://www.oznium.com/relay200/tech Thanks, Bill |