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The after treatment harness is in sections there is one the covers the dpf filter one covers the def doses and they plug into a main harness inside the right inside of the frame rail and run to left side to the def tank and pump then off to the after treatment control module (acm) could be shorted anywhere in between those points easy way to track down the short is follow the harness and look for any green corrosion on the harness loom especially when it rubs against anything or is kinked or has sharp bends
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