Alternator issue? Or FICM? - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 08-29-2011, 04:55 PM Thread Starter
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Alternator issue? Or FICM?

Ok, in the last three months, when I start my truck cold, from time to time the battery light will come on for a minute or so and then go out.

So I put my battery voltage and FICM voltage on my Edge CTS, the battery voltage will vary between 11.8 to 13.8 and the FICM voltage, on cold start up, will be around 43-45 volts and after a bit comes up to 46.5-48.5 volts.

Tonight I went out, and with the truck cold, the key on, engine off FICM voltage never dropped below 46 volts and my batteries with the engine off read 12V. With a meter, the batteries read 12.6V. After starting it, the Edge CTS was still reading .5 to .6 below what my meter read.

I tested the FICM with my meter before doing the PHP FICM remote reprogramming about 8-9 months ago and it tested fine, not saying it couldn't be starting to go bad. So what do you guys think? What do you think my next step should be?

2003 F-250 4X4 Lariat CCSB, Warren Diesel 190cc/75% injectors, ARP studs, EGR delete, Edge Insight CTS, CCV mod, Riff Raff Diesel intercooler boots, SCT X3 running Super Panty Dropper tune, 3.5" DP with straight 5" exhaust, rebuilt trans w/ billet torque convertor, Swamps 58V FICM w/ PHP tune, PHP rollback, Airdog II, 190A DC Power alternator, more to come...
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post #2 of 14 Old 08-31-2011, 03:58 PM Thread Starter
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Any ideas?

2003 F-250 4X4 Lariat CCSB, Warren Diesel 190cc/75% injectors, ARP studs, EGR delete, Edge Insight CTS, CCV mod, Riff Raff Diesel intercooler boots, SCT X3 running Super Panty Dropper tune, 3.5" DP with straight 5" exhaust, rebuilt trans w/ billet torque convertor, Swamps 58V FICM w/ PHP tune, PHP rollback, Airdog II, 190A DC Power alternator, more to come...
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post #3 of 14 Old 08-31-2011, 04:20 PM
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Check the amps on the alternator, your gonna need a clamp on amp meter. At idle, the amps should be around 60amps with the factory 110amp alternator.

2004 F350 CC DRW King Ranch
X-3 tunes by DJ'S,QT,GH,ID. Gryphon FICM tunes, ARP studs,Stage 1turbo,ATS coolant recirc lines,Swamp's 48v ficm,coolant filter,AD2,Snow Perf stage II,EGR delete,4" turbo back straight pipe,S&Bintake,Quad "A" pillar autometer gauges,Suncoast Tri Disk Conv.,Billet input shaft,Suncoast superduty rebuild kit,Trans-go shift kit,Mag-Hytec trans pan,CFM+ elbow,ccv mod,15K reese 5er,17" LCD TV/DVD,Cobra 29 Nitewatch CB
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post #4 of 14 Old 08-31-2011, 08:13 PM
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My gut tells me alternator. It's fighting and probably on the brink...


04 6.0l Excursion
4x4
6" Lift, 35' BFG's, Powermax
AFE Intake, CFM+
Swamps 58v ficm, ARP, EGR delete
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4"MBRP SS exhaust cat/muffler delete
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post #5 of 14 Old 09-01-2011, 07:25 AM
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Yep sounds like alternator is going... Replace it before it dies completely
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post #6 of 14 Old 09-04-2011, 08:36 PM
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Having a similar issue with my truck.Cold starts that will shake your teeth and the battery light flickers a few times.I just replaced the alternator in march and had it check about 2 months ago when I replaced the idler pulley.
I guess I'll be pull the alternator and getting it checked

2003 6.0L F250 4x4 Lariat
Fog Light Mod,High Idle Mod,Zoodad,Hose clamp taligate mod,08 rear bumper,Sinister EGR delete,ELC EC-1 coolant,Edge Juice,MKM(Sinister)coolant filter,HFCM drain plug upgrade,diy FICM repair(steady 48.5v now),DIY CCV mod,Torque Pro,Blue spring upgrade,Aluminum radiator,05 headlights,LED foglightd

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Y-pipe,fuel pressure gauge,diy oil bypass(maybe centrifuge),oil pressure gauge
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post #7 of 14 Old 09-05-2011, 08:38 AM
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Am I missing something here? I'm not very mechanically inclined and trying to learn as I go here so bear with me...

From what the OP said I don't see a battery voltage/alternator problem, I see an FICM voltage problem.
From my limited knowledge bat volts at 12 KOEO is good, starting they drop to 10-11 and then come up to 12-14 KOER. If the bat voltage was staying low KOER I would think alternator.
FICMV at 48 KOEO and above 45 starting and running. FICMV below 45 on a cold start tells me that the FICM is on its way out.

So what have I missed or what do I have messed up here?

2005 - Excursion - Eddie Bauer - 4x4

185amp DC Power Engineering alternator
BPD oil cooler and cold weather package
Updated standpipes and dummy plugs
Edge Insight CTS with fuel pressure
No more STC fitting in the HPOP
Updated fuel pressure spring
Updated turbo oil drain
Updated turbo oil feed
Sinister Coolant Filter
BPD 58V FICM
Dual Batteries
Rotella T6
CAT ELC


The best 6.0 advice I've ever seen... By NYC F-350
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post #8 of 14 Old 09-05-2011, 11:11 AM
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Quote:
Originally Posted by Fishermedic View Post
Am I missing something here? I'm not very mechanically inclined and trying to learn as I go here so bear with me...

From what the OP said I don't see a battery voltage/alternator problem, I see an FICM voltage problem.
From my limited knowledge bat volts at 12 KOEO is good, starting they drop to 10-11 and then come up to 12-14 KOER. If the bat voltage was staying low KOER I would think alternator.
FICMV at 48 KOEO and above 45 starting and running. FICMV below 45 on a cold start tells me that the FICM is on its way out.

So what have I missed or what do I have messed up here?
The FICM needs to be tested with good batteries and charging system, if he has weak batteries/alternator, he will get a weak FICM volt.

This is where the OP needs to check all his battery cable connections (at battery and to the motor) for corrosion/bad connection. Load test the batteries separately and test out the alternator amp output.

2004 F350 CC DRW King Ranch
X-3 tunes by DJ'S,QT,GH,ID. Gryphon FICM tunes, ARP studs,Stage 1turbo,ATS coolant recirc lines,Swamp's 48v ficm,coolant filter,AD2,Snow Perf stage II,EGR delete,4" turbo back straight pipe,S&Bintake,Quad "A" pillar autometer gauges,Suncoast Tri Disk Conv.,Billet input shaft,Suncoast superduty rebuild kit,Trans-go shift kit,Mag-Hytec trans pan,CFM+ elbow,ccv mod,15K reese 5er,17" LCD TV/DVD,Cobra 29 Nitewatch CB
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post #9 of 14 Old 09-06-2011, 05:44 AM
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Got it.

I knew that the batteries needed to be checked first but didn't think about the alternator. I was thinking that since the battery voltage was recovering quickly to where it should be while the FICM voltage was staying low the FICM would be the more likely problem.

I'm still learning to trouble shoot mechanical problems I guess. I already know that all possibilities need to be addressed before you know for sure what the problem is and what parts need money thrown at them AND if you don't do this you'll spend more money than you need to. Thankfully I haven't learned it from my own experiences but if I don't learn to check all possibilities every time (even when I think the problem is fairly obvious) I will have the experience first hand. Thanks for the help Lilpooh.

2005 - Excursion - Eddie Bauer - 4x4

185amp DC Power Engineering alternator
BPD oil cooler and cold weather package
Updated standpipes and dummy plugs
Edge Insight CTS with fuel pressure
No more STC fitting in the HPOP
Updated fuel pressure spring
Updated turbo oil drain
Updated turbo oil feed
Sinister Coolant Filter
BPD 58V FICM
Dual Batteries
Rotella T6
CAT ELC


The best 6.0 advice I've ever seen... By NYC F-350
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post #10 of 14 Old 09-08-2011, 03:43 PM Thread Starter
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Ok, here are my test results on my alternator.
On startup, batteries read 12.6V. After startup, no amperage for a minute or so which I understand is normal. With no load, the amperage then goes up to 70A and then will start to drop, I stopped watching when it got down to 40A and that's at 13.8-14V. With the AC and lights on, the amperage goes up to 72A and the voltage drops to 12.8-13V. This is all at an idle, do all these values seem ok? The voltage dropping to 12.8-13V at idle with the loads on kind of seems low but I'm not sure.
And would any of these readings explain my FICM voltage variance?

2003 F-250 4X4 Lariat CCSB, Warren Diesel 190cc/75% injectors, ARP studs, EGR delete, Edge Insight CTS, CCV mod, Riff Raff Diesel intercooler boots, SCT X3 running Super Panty Dropper tune, 3.5" DP with straight 5" exhaust, rebuilt trans w/ billet torque convertor, Swamps 58V FICM w/ PHP tune, PHP rollback, Airdog II, 190A DC Power alternator, more to come...
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