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92 Mack 612 E7 Won't Start


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Used as Mobilhome tooter, I hadnt started it for a year or better. Turned on Ins. only dash light that came on is low air. Starts and runs for 3 or 4 seconds and dies, will restart 3 or 4 seconds. Heater fan works, I believe all the fuses are ok. Mack said no power to the ECM "maybe" I have NO paperwork. ANY ideas would be helpful.

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