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Yeah the issue with checking the heater is the fact there are 7 wires going to it, 2 are for the heater the rest are for various sensors, I cant find a diagram anywhere to know which 2 wires im checking. All of them do have continuity though, so I assume heater is working due to that fact!

Hi all, trying to diagnose the "Adblue system service required" No start condition. The truck has been in storage for a few years and has only done 30k miles, all wiring has been checked and cleaned, all adblue system and components have been checked etc also. Everything is clean and has no...