'The Min' has been put into a well earned retirement, for services rendered, and will now only be taken out of the vault for brisk weekend and fair weather runs. It deserves it.
It has been rebuilt right up from bare shell, and I am nearing completion. I have added a lovely 'stereo' system ( for us oldies ) and I am concerned that it will drain the battery whilst 'the Min' is garaged and resting between rain storms.
Question: I have an FIA rated battery cut off switch to isolate the car when garaged. I wish to add a small second battery (12 Volt x 6 Ampere Hour? Yuasa? motorcycle?), to keep the settings of the 'stereo' when the battery is isolated. It will be fed through a relay to avoid cross feeding and back leakage, when the main is isolated, but I am concerned that it will not have a regulated charging circuit to feed it.
SO: Can I simply connect it to the feed to the radio (13.7 Volts when car running) or do I need to add a regulator etc to stop it going bang due to overcharging etc?
Or is there an after market system you can tell me about?
Thanks in advance for any replies, you have always been a great source of information.