Ford Powerstroke Diesel Forum banner
1 - 5 of 5 Posts

·
Registered
Joined
·
278 Posts
Discussion Starter · #1 ·
Only sometimes, and only when it's really cold, the CTS alarms that my FICM volts have dropped below 45. Usually only to 44v and only for a second or two. Once it warms up a bit it's solid between 47.5 and 48.5.

My background is in electronics and I have a lot of soldering experience, so I'm thinking I'll try to re-solder myself. I'm hoping that's the only problem is it's very marginally bad at this point and not a total disaster. If it works, I save a ton of dough. I've read the DIY re-solder instructions, but have only seen 4 pin FICMs documented. I believe I may have 7-pin. If I do, I'll try to write-up my process for others to reference. (If anyone knows of an existing reference, that would be even better.)

My main questions is, if I re-solder and it doesn't work or only lasts for a while, would this impact my ability to recover my core charge if I have to replace the FICM power supply at a later time?
 

·
Registered
Joined
·
278 Posts
Discussion Starter · #4 ·
Hmm, reading up on FICMs and found that weak batteries can be a factor, so I decided to focus some attention there.

A "cool" start at lunch after sitting 4 hours in 30-35 degree weather and I caught a glimpse of 10.6v during cranking after 12.3v koeo. Those both seem low to me. 14+ volts while idling, so I think the alt is ok. I guess I need to get them load tested.
 

·
Registered
Joined
·
278 Posts
Discussion Starter · #10 ·
Saw a 9-something volts flash on-screen while cranking this morning (forgot to turn on the block heater so ECT was about 34F). It then ran at 11.7v for a minute until the plugs shut off and then jumped up to 14+. They are 850CCA Motorcraft batteries and marked as installed August 2011. Not really thrilled about the battery brand, but the sticker says under 36 months is 100% free replacement, 36-100 months is pro-rated, so I might be able to catch a break. Unfortunately the local Ford dealer was getting a new floor installed in the service dept today, so I'll have to stop in next week.
 

·
Registered
Joined
·
278 Posts
Discussion Starter · #11 ·
Well the batteries load tested fine. The dealer said they wouldn't have honored the Motorcraft battery warranty anyway since I didn't have a copy of the original invoice. The more I think about it, I'm leaning towards replacement instead of repair.
 

·
Registered
Joined
·
278 Posts
Discussion Starter · #14 ·
You might have a starter going bad. Check out this video around the 17 min mark. They said if your battery voltage drops below 10.9V while cranking, it may be your starter.

TKU # 904 ? Misdiagnosis | TruckU
They did say there was corrosion on the starter terminals and they cleaned it up for free with the battery check. I'll have to keep an eye on this. Thanks for the info.
 
1 - 5 of 5 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top