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Hello, my name is ***** ***** I will do my best to assist you today. Give me a minute to pull up the diagram and see what circuits fuse 7 powers up. This is fuse 7 in the PDC under the hood, or the fuse box in the cab?
Okay thanks. Be right back
Ok, fuse # 7 inside supplies power to the BCM, instrument cluster, audio amp (if equipped), and auto headlamp sensor (if equipped). Click on the link below to see the diagram. Try disconnecting the BCM and cluster next. I have seen the BCM cause this. BTW.
Sorry, did you say that you have tried 3 BCm's?
If you disconnect the BCM does the draw go away? Something may be keeping the BCM "awake"
Let me think about this.
I wonder if one of the door key cylinder switches is stuck. They are all hard wired to the BCM. Do you have scan tool that will display BCM inputs and outputs?
Gotcha. Well on that vehicle, only hard wired inputs should "wake up" the BCM And I think the next step is to check those key cylinder and door ajar switches. Maybe disconnect them one at a time, then allow 10 to 20 minutes for the BCM to power down. Let me know if that helps.
Several Snap on scanners with the older software will interface with that BCM. I know because I used to consult for Snap On years ago. Maybe you can find or rent an older one. Just a thought.