Splice two cables together to get functionality?

hello bought ai-net ipod cable older alpine head unit in car, because i'm absolutely tired of fm transmitters. new cable works play music iphone 4 , sounds great. problem charging not supported since used old circuitry previous ipods/iphones. i've seen circuitry converters, i'd rather not spend money on one, if dont have to.

question if have charge/sync cable, , splice dock connector cable in place of old connecter on audio cable work? have knowledge of splicing wires thats not issue, comparing 2 dock connectors , see number of pins in each 1 different. audio cable seems have pin connection @ every spot, while charge/sync cable have seems have six. checked old fm transmitter , seems have pins @ every spot. take connection, not cable. it's block plugs ipod/iphone.

know if splice work or not? or maybe other knowledge contribute situation? great. thanks.

 

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long isolating head unit there no feedback incoming power supply good! remember keep cable short possible.

 

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