I'm thinking of adding a small battery in the rear of the Vic to help the audio system out a bit, but I am cheap and I was wondering if this will work and which configuration is best.
The battery up front is a group 65.
I want to add a group 51 in the trunk with an isolator for the system and I was thinking about using a Ford-style starter solenoid as an "isolator" so that it connects the trunk battery to the main system whenever the key is On and the radio is on. Once the radio is turned off or the key is turned off the trunk battery will disconnect from the main supply. I'd have to add a relay to the remote wire that gets a switched 12v source but here's the basic idea:
I could do 2 different configurations.
a: the trunk battery is connected whenever the ignition key is on
b: the trunk battery is connected whenever the ignition key is on and the stereo is on
I want to do configuration "A" so that the battery stays topped off but I would like an expert opinion first.
To do B I just add a relay in line to the solenoid with a 12v switched ignition source to the 30-pin and a remote wire to trigger the relay (85/86)