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I first ordered the Scosche TA02B wiring harness to hook up my JVC deck. This was clearly not the correct part. I just ordered the Metra 70-2105, which looks like it'll fit.

The harness includes a red wire to be used for ACC power. Apparently this isn't part of the factory wiring harness and I'll need to tap a source of ACC power somewhere in the car. Does anyone have any suggestions on what to use?

Well I got it figured out. Some info for others:

The Metra 70-2105 wiring harness works fine. You need to move the red pin to position 12 (bottom row, 4th from the right when looking straight on) for ACC power and there is no orange (dimmer) wire. I had to splice directly from the head unit wiring harness orange wire to a small green wire in the middle of the same plug that gave you ACC. Use a test light or voltmeter to confirm this.

Scosche also makes the GM18B, which appears to include the orange wire. You should confirm its placement. You will also need to move the red wire on this harness as well.