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GM non Bose loop back harness


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Is there anyone here that could tell me how to make a loop back harness for a 2015 gmc Sierra double non Bose? I have the twometra 71-2107 & 70-2057 connectors

Posted

Llj customs makes one. And it's good to buy their module as well.  Takes the loud chimes and blinker sound away. It's fairly inexpensive to

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