This vehicle has no comm with ecm and is a cranking no start. The instrument cluster display shows comm fail with ecu. There is an eecu 20 amp fuse in the underhood fuse/relay center that only has 2.7 volts at it. If I apply 12 volts to this fuse we have comm, truck starts and runs. Can anyone tell me where this fuse gets its power from?
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2004 Freightliner MT45 5.9L No Start