Join Date: Oct 2009
Location: Wichita, KS
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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...