Quote:
Originally Posted by rsjean
I believe the suggested method of attaching the battery to the terminals under the hood should work. An open circuit is different for DC versus AC and I believe the car wiring takes this into account.
I know that a 12v battery attached to a cigarette lighter plug can be used to maintain settings on things like your radio and clock when the main battery is removed so there must be a complete citcuit from there to those devices.
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^^ above is true... hooking a jumper pack / batter to underhood posts power the vehicle up just as if the BST cable popped in an accident. accessories will work, like the trunk release button in the drivers foot well..
also i just looked at an '09 128 and it has a key hole to the right of the passanger side lic. plate light. what production date do you have???
I have an '11 and never noticed if the key hole is back there. ill look
good luck ..