Hello,
I read that in order not to lose the radio code while replacing a car battery, the leads of the battery should be connected to a secondary power source. I have a booster/jumper pack which I would like to use as the secondary power source. While using it to jump start my car, i was advised to connect the black clamp to the chassis of the car but not to the black terminal of the battery. Should I do the same when I replace the failing battery? If so, will the radio code be kept? I am just concerned that by leaving the black lead, which connects to the failing battery, unconnected until i mount the new battery, the radio code might be lost as the electronic parts of the car won’t be powered with the jumper pack
Thank you