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Bad FICM cause alternator Problems?
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Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Bad FICM cause alternator Problems?
Hey All!
Spent a lot of time in the SD Tech Folder yesterday and I'm going to check my FICM this morning. I have the exact cold start issues everyone was talkin about. On top of that, I can't keep an alternator in my truck. I get an intermittent battery light after 10 miles or so and it goes on and off randomly after that. Batteries load check good, cables clean and tight etc. I've replaced the alternator twice in the last 6 months (since I got the truck) and over the holidays I pulled the alternator and took it to a good repair shop. They said they replaced the diode plate. Think the power draw from a bad FICM could take out the diode plate?
Oh yea, 2006 F250 6.0 Diesel. (still trying to get the hang of this new "internet" thingie!??)
Spent a lot of time in the SD Tech Folder yesterday and I'm going to check my FICM this morning. I have the exact cold start issues everyone was talkin about. On top of that, I can't keep an alternator in my truck. I get an intermittent battery light after 10 miles or so and it goes on and off randomly after that. Batteries load check good, cables clean and tight etc. I've replaced the alternator twice in the last 6 months (since I got the truck) and over the holidays I pulled the alternator and took it to a good repair shop. They said they replaced the diode plate. Think the power draw from a bad FICM could take out the diode plate?
Oh yea, 2006 F250 6.0 Diesel. (still trying to get the hang of this new "internet" thingie!??)
Last edited by Rusty Axlerod; Feb 6, 2011 at 11:37 AM. Reason: Add Vehicle info
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Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Update. After alternator repair for the second time, decided to test batteries "one more time" and the passenger side failed load test! This battery had been check four times previously and passed each time. I'll see in a few weeks if it is truly fixed this time.
Elder User
Joined: Aug 2010
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From: NV
It is usually recommended to replace the batteries in pairs so that they balance the charge. How old are they?
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More Turbo
Joined: Feb 2004
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From: New Orleans to San Diego
Yep, go ahead and change both.
At least its cheaper than replacing, fixing a bad FICM like i have to do
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Joined: Apr 2008
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From: Green Lane, Pa.
Hey All!
Spent a lot of time in the SD Tech Folder yesterday and I'm going to check my FICM this morning. I have the exact cold start issues everyone was talkin about. On top of that, I can't keep an alternator in my truck. I get an intermittent battery light after 10 miles or so and it goes on and off randomly after that. Batteries load check good, cables clean and tight etc. I've replaced the alternator twice in the last 6 months (since I got the truck) and over the holidays I pulled the alternator and took it to a good repair shop. They said they replaced the diode plate. Think the power draw from a bad FICM could take out the diode plate?
Oh yea, 2006 F250 6.0 Diesel. (still trying to get the hang of this new "internet" thingy!??)
Spent a lot of time in the SD Tech Folder yesterday and I'm going to check my FICM this morning. I have the exact cold start issues everyone was talkin about. On top of that, I can't keep an alternator in my truck. I get an intermittent battery light after 10 miles or so and it goes on and off randomly after that. Batteries load check good, cables clean and tight etc. I've replaced the alternator twice in the last 6 months (since I got the truck) and over the holidays I pulled the alternator and took it to a good repair shop. They said they replaced the diode plate. Think the power draw from a bad FICM could take out the diode plate?
Oh yea, 2006 F250 6.0 Diesel. (still trying to get the hang of this new "internet" thingy!??)
The answer is a faulty alternator can lead to problems with the FICM once the voltage from the batteries drop.
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Lead Driver
Joined: Feb 2011
Posts: 8,241
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From: L.A. (Lower Alabama)
They were stickered as 8/08. Dropped in a new pair of Duralast gold tops ($265) and the alt with new diodes/plate/regulator. Seemed to run noticably better and gas mileage was up a couple of MPG's as a bonus. Only 40 miles or so on it so far though, I'm not gonna be completely satisified until it goes a couple of months with no battery light.
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Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
I guess the odd thing about this problem is the bad battery checked good several different times before I caught it. The batt light was on when I shut down the truck the last time-maybe that's why it showed bad. I've heard of plates warping or bad terminal connections inside the case. But I never had on go bad intermittently like that before.
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
You got that right, and IMHO motorcraft remaned alternators are one of the worst. They last just long enough to get out of warranty (13 months maybe) which makes the lifetime warranty parts the way to go (sometimes).
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