I got the harness at Wal-mart for $2 at it worked fine haha, just extended my own wire. The ACC wire is the red wire coming from the HU. Look up alarm wiring diagram for your truck and it will tell you what wire under the dash is the ACC wire, tap into that.
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MECP Certified.
Alarm: Viper 5200
HU: Stock
Active Set-Up
Tweets: Image Dyamics CD1pro mini horns
Mids: Sundown Neo Pro 8s
Amp: Kicker IX500.4 (2)
Sub Stage
Subs: (2) Dayton Audio 15" HF
Amp: Kicker IX1000.1