Did my alternator kill my FICM?

[jonnyjeeps]

So last week my truck finally died. It had been getting harder to cold start in the mornings, and I honestly never even considered the ficm till that day. The voltage was low so I pulled it and sent it off to swamps for repair. I figured bows a good time for a HO alternator so I ordered a 190amp from dc power. Anyway, I got everything put back together today and the truck fired up sooooo fast(faster than ever before)and to my suprise it's not belt chirping anymore.

I had "the chirp" for 6-8 months before and checked the alt, pulleys, replaced the belt but it wouldn't go away. The factory alternator always put out 13.5+ so I never thought it was bad. Just wondering now in hindsight if the alt slowly dragged my ficm down and out?

[Enterko]

were you able to monitor your voltage while it was cold? ie did you have a monitor like a edge insight?

[Snake]

I went through something similar and asked several very reputable companies / sponsors about this. All agreed that a weak alternator will kill your batteries, then your FICM, then your injectors.

[jonnyjeeps]

Originally Posted by Enterko

were you able to monitor your voltage while it was cold? ie did you have a monitor like a edge insight?

No I have no in cab gauge for voltage, but that's gonna change.
The truck really does run great though, it's hard to believe this is how it was when new, I guess the slow decline makes it harder to notice.