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Discussion Starter · #1 ·
Hey guys I'm in the process of modifying the 5.3 harness to work in my truck and from the excel diagrams I got it looks like I need to Repin the fuse block which I knew that, and the connector that plugs into the chassis harness? I was not sure about this part.


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Use your factory fuse block engine harness and mate the 5.3 harness to it so everything works like oem.
 

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Discussion Starter · #7 ·
Did you guys extend any of the fuse block wires? I made my harness a little different since I didnt want my pcm wire running over top of the engine so I extended them enough to run around to the firewall and across.
 

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Yeah its not easy & def time consuming & it sucks when you get it wrong.

I did mine by myself after reading Calebs thread about 100 times. LOL
 
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