'2011 F250 6.7L Electrical Issues - Diesel Forum - TheDieselStop.com
'11-16 General Questions General questions related to 2011-Up Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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post #1 of 9 (permalink) Old 04-28-2017, 02:15 PM Thread Starter
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'2011 F250 6.7L Electrical Issues

First time poseter here hoping you guys can assist me before I have to break down and go to a shop. I did a search but have not found a definiteive answer for the newer 2011-2016 series.

I have a 2011 F250 6.7. A couple days ago when my wife was driving the instrument cluster, radio, blinkers, dash display all started to blink on/off. The fan would turn onto high whenever this happened. The battery light also started turning on, off. Several of the alarms would appear on the screen and some of the fault indicator lights would turn on, along with the chimes. I have removed and cleaned the battery terminals on both battery's. I measure both while disconnected and get ~12.5v on each, and the same when connected. I then get ~14.5 while running. I have looked at all the connectors in the cab I could see, the passenger side fuse panel in the cab, and tugged on every wire I could reach in the engine. I was not able to create the problem when doing this and did not find anything loose that solved the problem.

Does anyone have any suggestions? I know it could be a ground but I have no idea where it could be, I have also read about it being a canbus issue but again can't find much details.
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post #2 of 9 (permalink) Old 05-02-2017, 04:10 PM
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Interesting? Any update.
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post #3 of 9 (permalink) Old 05-03-2017, 07:20 AM Thread Starter
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Interesting? Any update.
The truck finally started acting up when in the driveway and not just when running. While it was acting up the alternator reads 16.9vDC. Talking with an ex Ford service tech he said I should have a ton of High voltage alarm codes and the truck was shutting off the electronics as a safety. I don't have a reader to check myself and my garage is tied up so I won't know for sure until next week but almost certain the alternator is shot.
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post #4 of 9 (permalink) Old 05-03-2017, 03:28 PM
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Thanks for the info

FYI:

Might want to look into a $5 app called Torque Pro and a OBDII bluetooth adapter. you can monitor the Alternator output.
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post #5 of 9 (permalink) Old 06-09-2017, 11:26 AM
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Originally Posted by ShipkaRob View Post
The truck finally started acting up when in the driveway and not just when running. While it was acting up the alternator reads 16.9vDC. Talking with an ex Ford service tech he said I should have a ton of High voltage alarm codes and the truck was shutting off the electronics as a safety. I don't have a reader to check myself and my garage is tied up so I won't know for sure until next week but almost certain the alternator is shot.
This is a somewhat common pattern failure on 6.7L trucks. The information you received from your "ex" Ford tech was accurate with regard to modules shutting down during over voltage events. I know I have made several posts in these forums about this concern but I will give you the basic run down. The PCM does monitor and enable the alternator and there may be circuit codes stored that should be diagnosed first. But most commonly, the regulator inside of the smart alternator uses a voltage sense circuit to monitor battery voltage and adjust output accordingly. This circuit is the small red wire in the three pin connector at the alternator. It comes from the battery, runs in a harness that goes down the right side of the engine, around the front of the oil pan in a plastic support and up the left side of the engine to the alternator. It is common for that wire to chafe or otherwise suffer damage to the insulation allowing water and road salt to corrode the wire eventually causing high resistance. As a result, the alternator sees less voltage on the sense circuit and raises the alternator output in response.

You could compare the voltage at that wire at the alternator and compare it to the battery voltage. Inspect the harness closely and anywhere you can see the small red wire pull on it. It may pull apart identifying the break.

Good Luck!
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Last edited by ford_doctor; 06-10-2017 at 05:42 AM.
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post #6 of 9 (permalink) Old 06-13-2017, 10:51 AM
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Originally Posted by ShipkaRob View Post
First time poseter here hoping you guys can assist me before I have to break down and go to a shop. I did a search but have not found a definiteive answer for the newer 2011-2016 series.

I have a 2011 F250 6.7. A couple days ago when my wife was driving the instrument cluster, radio, blinkers, dash display all started to blink on/off. The fan would turn onto high whenever this happened. The battery light also started turning on, off. Several of the alarms would appear on the screen and some of the fault indicator lights would turn on, along with the chimes. I have removed and cleaned the battery terminals on both battery's. I measure both while disconnected and get ~12.5v on each, and the same when connected. I then get ~14.5 while running. I have looked at all the connectors in the cab I could see, the passenger side fuse panel in the cab, and tugged on every wire I could reach in the engine. I was not able to create the problem when doing this and did not find anything loose that solved the problem.

Does anyone have any suggestions? I know it could be a ground but I have no idea where it could be, I have also read about it being a canbus issue but again can't find much details.
Hopefully you read this because i've had the exact same issue on one of my 15' f250 with the 6.7. The problem that there is a wiring harness that is coming loose or has dirt in it. It's located just above the parking brake under the dash. to see it you'll have to lay on the floorboard and look up the dash just behind the parking brake arm and you'll see what looks like a white/grey wiring harness plugged into a plastic module that attached to the A-pillar of the truck kind of. With the key and your gauges dead with tons of warning lights on just push the harness towards the rear of the truck to push it back in and your truck should be back to normal. On the 15' f250 i've had to pull it out and hose it off with some QD cleaner, i might even have to put some elec grease in there....

The dealer wanted to charge like $3k to "fix the problem" which included a full brake service because the a-trac light/warning was on AND to replace a steering column control module in the steering column.... and sure enough it was just a loose wiring harness......

If you need pictures or additional help PM me and i'll facetime you to help you.
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post #7 of 9 (permalink) Old 06-13-2017, 12:59 PM
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He HAS an overcharging issue... not a network failure.


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post #8 of 9 (permalink) Old 08-03-2019, 05:43 PM
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Any updates on this post my 2012 f250 is doing this. Dealership said it was primary alternator overcharging. Took both alternators off had them load tested and both were fine. Not sure what to do next but need my truck for work. Frustrating for sure
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post #9 of 9 (permalink) Old 08-05-2019, 07:15 PM
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Ask your dealer if they have checked that sensing wire that Ford Doctor mentioned. It is an increasingly more common problem. He is dialy working on these trucks and his posts are not speculative but are from seeing the problems.

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