P0720 and dead battery - Ford Powerstroke Diesel Forum
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post #1 of 1 Old 03-15-2010, 01:17 PM Thread Starter
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P0720 and dead battery

I just replaced my batteries less than six months ago. The batteries that I had in the truck were only a year old and were replaced under warranty because they failed. I did some basic electrical tests to check for amp draw with the key off, charging voltage, etc., but found nothing of real concern, so I assumed I just got bad batteries the last time around. During a recent blizzard here in Northern VA, I was out in 4WD high and as I was cruising down the road, the truck stuttered for about 5 seconds and the engine cut off. I immediately tried to restart it and my starter solenoid started to click. I finally got a jump from a firefighter in a Suburban with an HD charging system and dual batteries and I got my *** home as fast as I could, where it began to stutter again just as I pulled into my spot. At this time it was in 4WD low, the SES light was on, and the O/D light was flashing. I shut it off and let it get snowed in. A week later, I went to move the truck and the batteries were so dead it wouldn't even chatter the solenoid. I got it jumped again, took it out of 4WD (in neutral) and then engaged reverse. When I pressed the throttle, it made a whirring sound like it wasn't fully engaged in gear. It almost sounded like a REALLY bad P/S pump. I put it back in park, then back to R and it moved fine. Let it idle for about 30 minutes after I moved it so it could charge. During that time I checked codes and got a P0720. Truck didn't move for another 2 days. Went to start it again and it was dead. I've heard of the OSS causing problems due to RF interference from a bad alternator, but I can't help but think that there may be more than one problem (due to my tranny/4WD behavior). I know on some Explorers people have had problems directly linking the electronic 4WD and the OSS. If anyone has any ideas or has had a similar problem, please let me know. Thanks!

2000 7.3 Powersmoke Sexcursion 4x4, 3.5" straight pipe, 10K Ohm resistor mod, 6637 filter, Foil delete, Wastegate delete, MAP fooler, Zoodad, Amsoil remote full flow and bypass filter.
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