2005 F350 charging issue - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 09-09-2013, 07:56 AM Thread Starter
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2005 F350 charging issue

I have had a very weird charging problem I cannot figure out.
Every once in awhile my truck would hard start or no start. Dead batteries. Jump start and truck would be fine for days, even weeks.
Then same thing again.
Never saw the charging light on the dash at all.
Jump started it once and threw a meter on it. 13.6+/- volts. I figured, alternator is ok.
Happened several more times. I changed alternator. Truck was fine for a few weeks.
NOW, I am beginning to see charging light on dash every once in awhile. Stays on for a few seconds at a time. Weird.
Load tested both batteries(Optima red tops bought new in 2009) Load test fine. Hmmmm. Ran temporary wire from alternator to battery to see if I had bad charging wire.
This morning, got in truck to move a trailer around. Charging light was on the whole time(10-15 minutes or so).
Shut truck off. No start. Batteries dead.
Jump started. Light still on. System not charging and no battery power at all and truck actually died from no power.
Jump started. Charging fine, no light!!!!!!!!! Truck never gave me another problem all day.

WTF is going on???? Anybody got any ideas?
I have heard that something in the computer actually tells the alternator to charge or not charge? Any truth to that?
I am stumped
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post #2 of 11 Old 09-09-2013, 08:42 AM
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I'd double check all cable ends and grounds... Battery to block, block to cab, and cab to frame. never hurts to beef up the ground straps either! Better yet triple check those connections. Grounding issues can cause all sorts of weird issues.

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post #3 of 11 Old 09-09-2013, 08:43 AM
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post #4 of 11 Old 09-11-2013, 04:27 AM Thread Starter
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Ever since Sunday morning, I haven't had a problem at all.
Haven't seen the charging light on the dash at all.
Got in it this morning and it barely started.
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post #5 of 11 Old 09-14-2013, 01:29 AM
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Might be the voltage regulator inside the alternator. It's not impossible to have a remanufactured alternator w/built in voltage regulators be problematic right off the shelf. Have the alternator/voltage regulator tested.

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post #6 of 11 Old 09-17-2013, 04:41 AM Thread Starter
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Ok, I am still having the issue. Here are the things I have done:
- Run temp wire from alternator to battery
- Run temp wire from battery to fender ground
- Cleaned up grounding location on engine block
- Cleaned all battery posts.
- Checked plug in connection on alternator
- Checked plug on fenderwell where looped wire is

I have found that sometimes the dash light will be on solid and won't go off. Sometimes I can cut truck off, let it sit for about 30 seconds, start it back up, NO LIGHT.
Sometimes driving down the road, light will flicker on for maybe 1-2 seconds. It may do this every 15-20 miles if driving down highway.

I have heard that the pcm actually tells the alternator when to charge or not charge. Any truth to that?

I am going to change the alternator one more time this weekend.
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post #7 of 11 Old 09-17-2013, 01:02 PM
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You have a bad alternator. Mine when doing the same would even pass a bench test I took it apart and performed the internal tests for the slip rings and it failed. Two NAPA alternators later that only past about 8 months I gave up. DC Power is your best bet and never have to replace it again.

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post #8 of 11 Old 09-17-2013, 02:09 PM Thread Starter
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Yeah, I'm gonna change alternator this weekend.
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post #9 of 11 Old 09-17-2013, 02:17 PM
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Had the same issue few years back. Check your FICM Voltage too.Mine was bad,caused it to barely crank over.


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post #10 of 11 Old 09-17-2013, 02:32 PM Thread Starter
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Well if batteries are charged, turns over just fine.
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