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im familiar with the chrysler LH line. i assume your trucks is similar, so yes the mileage is stored in the bcm. i know on gas engines there is an ASD (automatic shut-down) relay that kills injectors and coils, i would assume there must be something similar on a diesel engine and if you just wire a switch into that relay and force the ASD to kill the engine it might be easier. if im not mistaken, the key powers the ECM and BCM at the same time with the same wire, probably to another relay, so that might not help you.
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