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Blue/yellow Or Grey Wire?

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While in Japan I purchased a Rio Riot portable MP3 player (with 20GB hard disk) and on eBay bought an FM Modulator to connect it to the stereo in my IS200.

What I was thinking of doing was powering the FM Modulator from the same supply wires as the stereo so that it's only on when the ignition is on like the stereo. I've looked at the wiring diagram for the stereo under the workshop forum. It looks like there are two +ve power supplies to the head unit - one a blue/yellow wire from the radio1 fuse and one a grey wire from the radio2 fuse.

Which is switched on with the ignition?

(Its the old style CD at bottom, ie 2000 model, head unit.)

If anyone can help then I'd much appreciate it. Ta.

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