Battery Light On - Page 2 - Ford Powerstroke Diesel Forum
6.7 Electronics Discussion (2011-2016) 6.7 Electronics Discussion

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post #11 of 13 Old 09-27-2018, 01:45 PM Rookie
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I had the same issue about a month ago. Battery light came on, I monitored with voltage with SCT tuner. Took it to my buddies shop he load tested and checked the alternator, no problems. Next day drove about 15 miles and all my gauges and radio unit went crazy, voltage dropped down to 11. My buddy replaced the alternator. I drove it about 50 miles and the battery light came back on and headlights flickered and voltage dropped to 12. Took it back to my buddies shop, and they took it to an electrical shop and they replaced the above mentioned faulty wire. Light gone! Driving a few days later lights still flickered when voltage dropped below 14. Replaced alternator again and all is well. Now I am having an issue with my radio/infotainment system turning itself off and clock not working. ???????

Paid about $400 to have wire replaced.
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post #12 of 13 Old 01-09-2019, 02:56 PM Fanatic
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Well, my turn for the subject issue...

Light first noticed about a week ago during a 20 mile trip. Arrived destination, completed a few tasks, restarted the truck about 45 mins later, no light on the return trip. Figured it was just a hiccup in the system. Then day before yesterday, the light came back on as I was finishing a drive back home for the day. Started the truck the next day... no light when the engine started, but as soon as I put it in gear, the light returned.

Called the local shop, who agreed to try to fit me in during the late afternoon yesterday. Drove over, and the tech went to work. After about 2 hours, came in shaking his head. Said both batteries tested good, as did both alternators. Good voltage out of the alts, and good voltage into the batts. Tested the big fuse block on the firewall, stated that was good as well. Reported seeing a different code than in post #4 above. My code was P-0620, which is “Alternator control circuit – malfunction”. He determined issue had to be something between the PCM & connectors... possibly a chafed wire, possibly a bad connector, or even PCM going bad. Unfortunately, closing time was approaching... and to determine what would require me bringing the truck back in a leaving it next week when they could schedule me on the calendar, as this would take a couple of hours of labor to handle the issue. He also provided me a schematic showing where he theorizes the problem may be... which I've included in the attached file.

So, since the truck starts up fine each time, and otherwise seems to run ok (except I have noticed it seems to be idling higher than normal)... I figure I;'m good to go until they can get me back in the shop next Wednesday, and we'll see how it goes. I've bookmarked this thread and will show it to them when I return... maybe it'll help speed things along.

Will come back to update then...
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post #13 of 13 Old 08-10-2019, 01:31 PM Rookie
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Any news on this?

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