Charging, FICM and glow plug issues - Ford Powerstroke Diesel Forum
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Old 06-02-2013, 03:25 PM
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Charging, FICM and glow plug issues

Hey guys here's my problem.
This morning truck flipped all 8 glow plug codes P0671-P0678. Truck still started and ran fine. Just now alternator was showing 16volts+ on my edge which is usually a volt lower than that on the battery. It lasted for 15 minutes and flipped a high ficm voltage code. Not sure what it could be. Alternator was new last year but still thinking maybe voltage regulator. Any suggestions would be hugely appreciated. Thanks ahead of time guys!


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Old 06-02-2013, 04:44 PM
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Yea 16+ volts is not good, most things are designed for 15.5 volts max so be carefull and get that thing replaced before you need a new stereo, head lights and pcm computer.
Check all the battery connections and the output on the alt along with the grounds. May not know what voltage it's putting out if there are some corrosive connections
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Old 06-02-2013, 05:02 PM
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Quote:
Originally Posted by mhatlen View Post
Yea 16+ volts is not good, most things are designed for 15.5 volts max so be carefull and get that thing replaced before you need a new stereo, head lights and pcm computer.
Check all the battery connections and the output on the alt along with the grounds. May not know what voltage it's putting out if there are some corrosive connections
Okay thanks for the input. I've checked all my connections and they are all good and free of corrosion. I will replace the alternator first thing in the am. Hopefully that's all it is. Weird that all these problems happened together.


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Old 06-02-2013, 06:12 PM
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Charging, FICM and glow plug issues-imageuploadedbyautoguide1370225499.805120.jpg

Just a picture of what my edge is reading. That was at a stop light at an idle.


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Old 06-02-2013, 06:26 PM
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I would put a Fluke voltmeter on it too just to make sure nothing is out of whack and you don't waste any money on a new alt. 14.4 at idle is high unless you are pulling big power from something.
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Old 06-02-2013, 06:29 PM
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I will test it next time it does it at the alternator. Weird thing is that it only lasts 15minutes give or take. I have big stereo but it wasnt playing so it shouldn't still be drawing. Checked all connections to amps as well just to be sure


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Old 06-02-2013, 08:14 PM
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Just tested voltage on the alternator on startup after it sat for a while and got a 16.5 volts. Still flipping all 8 glow plug codes.


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Old 06-03-2013, 08:45 AM
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Update:
Replaced alternator and still over charging. Load tested both batteries independently and are good. Tried swapping out the Glow Plug Control Module and still overcharging. Without the module plugged in the truck will not overcharge. Without the module plugged in my edge will not read any boost neither will the dash guage.


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Last edited by dcbutcher; 06-03-2013 at 10:15 AM.
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Old 06-03-2013, 01:28 PM
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That is crazy sounding ?? Could a glow plug be pulling crazy power for some reason ?
Perplexed with the 15 minute thing too. Why would the glow controls be engaged for such a long period. Have you looked at the amperage draw ??
How is the ground wire at the chassis?? There should be a cable from battery ground going the fender, make sure it's in good order. You may try throwing on a additional ground cable from block to chassis to rule out a ground issue.
Usually when electrical stuff goes whacky it's ground related. Look here first.
You have used a Fluke or another voltmeter to confirm? correct ??
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Old 06-03-2013, 02:45 PM
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Problem solved. The fuseable link from voltage regulator was bad. Not sure how it managed to set off glow plug codes. It also still had power on both sides of link. Weird but it's fixed and a reminder to check the simple things first. Thanks guys!


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