FICM Question
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Tuned
Joined: Mar 2014
Posts: 452
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From: Cheyenne Wy.
FICM Question
Mt FICM seams to be ok, but the volts seem to fluctuate a lot from 47-48 never stays the same for more than a few seconds. Is that normal, went down to 46.5 once for a heartbeat and gave this one a minor heart attack. 
Posting Guru
Joined: Apr 2015
Posts: 1,817
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From: Yakistan, WA
Bottom line is, fluctuations in the FICM voltage is NO problem, as long as it doesn't drop below spec (45v) and as long as it has had a little fluctuation ever since you began monitoring it. If the fluctuations are new to you, and it use to stay at a particular voltage consistently, then you may have an issue starting to show itself.
Other than that, no need to worry at all.
My FICM has always fluctuated ever since I was able to start monitoring it. Between 47.5v to 46.5v, with an occasional 46v showing itself.
Even after my FICM rebuild from Ed, I still only show (with the same fluctuations going on) 47.5v -46.5v. But now I get an occasional 48v
and still the occasional 46v. No worries here.
Thanks to Ed's conversation, I now can stop taking one less Hyper Tension pill my doc prescribed me.
I do second the advice to at least get your batteries and alternator tested.
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