Hardwire this harness to the radios harness plug
Peterbilt
All Medium Duty COE and Conventional (330), COE Models Built After 10/86, Conventional Models Built 10/86 to 6/05
$25.00
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BT-00169
If You Need Help With Your Peterbilt radio wiring harness Application Call Tech Support at 1-866-424-0575
Use the harness below if you already have your stereo.
PETERBLlT
Use your own radio or purchase a Peterbilt Radio, Stereo from Big Rig Stereo.  All Stereo's purchased from BRS include a free wiring harness for your Peterbilt Semi.
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Big Rig Stereo allows you to have a PLUG & Play radio 2 ways.  Purchase the harness below for your new radio.
Purchase one of our BIG RIG STEREOS and we will furnish and connect the correct Peterbilt harness to the new stereo.  Now you are ready to plug this radio into the truck for a simple DIY install.
Wire this harness to the pigtail that comes with the new radio.  This is a simple procedure.  The colors match and the harness comes with instructions.  or...
If you don't want to change your factory radio or just want to add bluetooth to a existing radio...
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If the back of your factory radio has this plug
If the harness on your truck looks like one of these.
BT-ISO-DIN
$25.00
Conventional W/Prem Sound From 4/05 to present
Model 387 Built From 9/06 to present
Model 387 W/Prem Sound Built From 9/06 to present

UPDATE:  Have seen that this harness is used on 20001 and up Concert Class Petes as well.