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Hello,
I just purchased a 2013 F-250 6.7 with 63K miles. The truck is having an issue where the interior power flickers on and off. ( the dash board and stereo go blank but the engine keeps running). I am let to believe it is over charging based on when I plugged in the scanner. Any Idea to what could be the fix? its going to the dealer next week I just want to make sure it gets fixed correctly the first time. ANy help would be great.
For a single battery, around 14.6 when charging would be the norm, so being at 17.3 would be way overcharging. My guess is that it’s the same numbers even with dual batteries.
If so, then your system may be shutting off some electronics to prevent them from overcharging, which is good.
May be just a bad voltage regulatir or alternator.
Both batteries load tested good. I am hoping it is one of the alternator as well. It is concerning because the problem is intermittent. It is currently at the Ford dealership and I hope they could find clear evidence to what the issue is. Thanks again
I will certainly keep you guys updated. Another key thing I would like to mention is that-
Is that when I disconnected the driver side battery the truck started with no issues.
but when I disconnected the passenger side battery ( leaving the driver side battery connected) The truck down to crank over, leaving just a clicking noise at the starter.
So my question is should either battery on the truck be able to start the engine. Or do both battery's need to be connected? As this may contribute to the voltage problem I am describing
Depending on cable lengths and gauge, one of the batteries alone may not be able to start the truck, but...
While that voltage does indicate a bad alternator, it could also be a loose ground or power connection in the charging circuit. The kicker being that a bad connection can kill an alternator, so you might actually have two problems. Or just one of the two problems.
Carefully check for loose/bad/corraded connections first, and if all are good, I would replace the alternator.
DogRidesInBack and the "no start" issue are pointing to the root cause of your issue. Have seen the "high DC voltage" symptom on single battery vehicles with failing batteries (cells open). Reason: the alternator regulator is continuously trying to adjust to your truck's varying electrical loads, causing the high (and some low) voltage spikes. If not addressed it can cause you living hell with surviving/wounded electronic modules.
Strongly suggest cables/cable connections/grounds be thoroughly inspected and verified. Would be very surprised if alternator or regulator were found to be the issue.
04-21-2018, 05:45 AM
