I'm looking to do this to my '89, however, I'd like to do things a bit differently so I've got a few questions I was hoping you guys could help with..
I don't like dip switches nor does the thought of running two cables (3.5mm & charge) get me excited.. Instead, I'd like to wire up the Aux switch to say a cargo lamp switch for a more factory look and then wire in a USB switch so I can run just one cable to my ipod. Has anyone done this? I assume I need a resistor to drop the voltage coming into the USB port to 5v? That aside, I figure I just need an accurate wiring diagram for the standard 30 pin Apple connector and just make the proper splices but I'd like confirmation to know if it is straightforward like that.
Looking at the diagram for a standard 30 pin Apple USB connector, it shows pins 1&2 on the USB connector lead to pins 25 & 27 on the 30 pin Apple connector which are labeled as "USB Data Negative" and "USB Data Positive" but would those actually send an audio signal or not when plugged into my Ipod? Seems all I have to do is splice pins 1&2 of the USB connector into the small black & red wire like depicted in the write up and then presto, I've got a USB input instead of a 3.5mm input. I'm hoping someone can confirm that because then I'll start ordering parts. I picked up an EQ tape deck radio at a boneyard this past Monday, I'll be testing it tonight and then if it checks out, I'll begin doing the mod..
Thanks for the help fellas!
Wow, really weird timing on your post seeing that I just started researching how to do this myself last night. Guess great minds think alike haha. In my brief research I found a few pin-outs for the 30-pin/lightning end of the connectors, but nothing so far that shows it at the USB end. I’m sure it’s out there just going to have to look closer, otherwise I’ll sacrifice an old charge cable and trace the wires. My plan is similar to yours except just tapping it into my existing setup. I figured run the charging circuit to a fused constant 12+ source and tap the analog audio parallel into my aux jack. Will research it more tonight. Let me know what you figure out and I’ll do the same.
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