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I’m trying to install an aftermarket radio with out cutting factory harness. My dilemma is the adapter pieces I’ve bought do not fit the oem harness coming out of my truck. I have a single cab s10 base model. 2.2 engine.
 

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time to get cereal
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Year would help...
 

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Been there Done it
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Metra 70-2003 GMHarness 1998-2006 (24 pin)
  • Allows for the installation of an aftermarket radio using the existing factory wiring and connectors
  • No cutting of factory wiring needed

350085

or
Metra 70-1858 GM 1986-2005 Harness (21 pin)
350086

There is some overlap of which one fits depending on which radio your truck has. Compare them to the old radio's plug and it'll be obvious which you need.
I'm pretty sure in the S10 trucks the 70-2003 is only for 2002-1/2 up trucks which had the RDS double din radio. While the 1858 fits everything prior to that.
 
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