Can a bad ECM cause low idle rmps?

Asked by Aug 30, 2017 at 06:34 PM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

I'm having an issue with my alternator not charging
high enough while it's in gear if I'm stopped it will
drop to 12 volts charging while I drive it'll charge
between 13 and 14.2 volts. I've been having
charging issues for a while used a half-dozen
alternators finally ran a key on power from a new
source to the alternator and I'm not burning up
alternators now. Any ideas?

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