Total Idiot Newbie

[deepfat]

Hello and thanks for letting me join.
I have a (to me) classic 2002 MG TF fitted with a simple Sony CDX-DAB6650 to help drown out the bangs and crashes the car makes. My problem is working on the car I constantly have to disconnect the battery and lose the units memory (PITA), my plan (probably wrong) is to fit a battery cut off switch but run a feed from the permanent live side of the switch to pin 4 on the units connector whilst isolating the wire that goes to this pin now. My question is if I do this is it possible for power to leak thru the unit and back into the main loom? and cause me problems. if so I wont do it so is there another solution to my problem.
You probably thinking how did that idiot learn to drive? I can only say I totally agree with you BUT HELP PLEASE.

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[metalheadjoe 10+ year member]

As long as you don't run through (or in parallel with) the vehicle's factory wiring you'll be fine.