7.3 Died on Highway, no crank, no power - Ford Powerstroke Diesel Forum
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Old 05-26-2014, 09:24 AM
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7.3 Died on Highway, no crank, no power

I was driving back to Texas yesterday and about 20 miles north of Gainsville, the check engine light came on and then immediately lost all power. I rolled to a stop and turned the key off and turned the key back on to see if it would crank and had zero power other than a fast click that would happen if either door was open and would go off when key was in ignition. When the engine light came on before it died, it sounded like a ground wire touched the frame or something and sounded like the turbo or transmission was playing through the radio. No electricity circulated to any of the electronics throughout the truck. I still have about 10 gallons of diesel in both tanks and checked the fuel filter housing just in case and it was still full. Only about 2k miles on oil change. I do have a windshield crack but have not noticed any leaks. I only say this because I'm unsure if the PCM would get wet and go out. I guess my main question for y'all is a quick diagnostic of the possibilities. Would this be an alternator issue? I replaced both batteries about 7 months ago. I checked all battery cables and ground cables that I could see and everything seemed to be fine. I have 240K miles and haven't had a single issue other than glow plugs at 130k. She has treated me well until now. I'm only stressing because my vehicle is depended on my income and have jobs lined up for this week. The truck is basically stock other than a Tony Wildman 6 position chip, exhaust and intake. I had the truck towed to Gainsville and is sitting at Hunters Oil Depot awaiting a diagnostic until they open tomorrow. Any help would be appreciated.
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Old 05-26-2014, 10:44 PM
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Check that you have power with a volt meter both at the batteries and at the fuse box under the hood. Also check voltage while cranking. If you can't crank, try jumping the relay on the passenger fender. My guess is you aren't getting power at that fuse box or blew some fuses.
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Old 05-27-2014, 05:17 AM
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^^^^^ Main power issue - batteries, connections, battery ground cables, etc. It wouldn't be specific to the PCM, because the starter circuit does not involve the PCM. If it's not cranking, it's main power, and rapidly clicking relays is a classic symptom.
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Old 05-31-2014, 04:27 PM
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If you got an RPM-dependent whining in the stereo, that's likely alternator noise, and you should check that the alternator is functioning.

What's the battery voltage right now? It sounds as though you could have lost the alternator, and then drained the batteries.
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Old 06-03-2014, 08:55 PM
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The Relays are clicking because the voltage is low. This could be because of a poor connection, or a low battery. If the battery went low while driving it is a good chance your alternator could be bad, or something related to the charging system.

Try charging the battery and see if it will start and run. You could jump it off but that is hard on your batteries and charging system. If it starts, watch the voltage. Preferably with a voltage meter and see if it stays around 12.8. If it goes down it's your charging system. I would start looking at your alternator.
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