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Message:: [QUOTE="Inderjit, post: 11755725, member: 204344"]I deal with this all the time with Maxxfarce 9 and 10 engines. Start with the battery connections at the batteries and at the starter. Confirm all the ground connections from the starter to the block and frame are good. There are 2 or 3 ground studs on the top left of the firewall. Make sure they are clean and tight. There is a 3 wire power and ground harness that connects to the battery cables in the battery box called the "Clean Power Harness" It supplies power and ground to the ECM. There is a 40 amp fuse in the battery box in the clean power harness as well as a large 3 pin Metripac connector check them both for corrosion. Follow the clean power harness to the firewall where it plugs into the chassis harness with another  3 pin Metripac connector. Check that connector as well. Look for expanded connectors and corrosion. The clean power harness is notorious for rubbing through and the wires corrode. I have seen them green with corrosion and no wire left inside the insulation just corrosion and the engine would still start and run.[/QUOTE]