Holden Kingswood AM Radio Voltage.

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Hello,

I know this might be a bit off topic but i need some help.
I'm getting a HX Kingswood and I don't want to put a new radio in but rather keep the old one and have an AM to iPod adaptor, i'm wondering which one from this list do i need to buy as i'm a bit confused about the voltages required for the HX.

Thank You

[IvanTheTerrible]

12 volt negative ground.

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Thank you very much :-)