Make sure the ipod will still play and CHARGE from the digital connection. many ipods and all iphone 3g and 3gs will not charge from many car connections. Some BS about over charging and/or draining car batteries with the original iphone.
I never had that problem, but Apple fixed it for me anyway.....
Really P!$$&) me off too.
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I do the things that I must, and really regret, are unfortunately necessary.
RIP OBG