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Old 01-11-2020, 10:23 AM   #1
bigmoe
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Join Date: Oct 2014
Location: Brandon, Manitoba, Canada
Posts: 961
Gen IV harness. What's this plug?

I've got my motor ready to go into my truck. Thought it would be easier to put the harness on before it's in the engine bay. It's a Gen IV 08 5.3. I can't figure out what the purple plug is for on the left of the picture. It's at the same end as the big plugs for the ECM. It's on a fairly long lead. I assume it's goes somewhere off the engine. (The picture is not my harness but a pic of PSI's harness.) Not seen on the right side is the OBD II plug.
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