got new battery and altenator, but alternator is still not charging battery could it be the pcm

Asked by May 24, 2016 at 11:44 AM about the 2000 Mercury Mountaineer

Question type: Maintenance & Repair

First off, I let my goofy brother hook up my battery and he put the terminals on backwards and tried to start it. In addition, I had to change many blown fuses. the alternator and battery are both new, however, the batt. light is still on and the alternator is not charging battery. could the pcm be bad, it don't seem likely to me seeing how everything else in the truck works ??

1 Answer

5,055

Yes, you may have fried your PCM but if the car is running and showing you the electrical system is not charging, I would look elsewhere. Double check belt tension, wiring to the new alternator, and wiring to the new battery first. Maybe something was not tightened down. If not those things, start with the alternator and have it tested even if it is new.

Your Answer

Mercury Mountaineer Experts

  • #1
    Tom Demyan
    Reputation
    580
  • #2
    kbro
    Reputation
    460
  • #3
    tuff4x4
    Reputation
    300
View All

Related Models For Sale

Used Ford Explorer
796 Great Deals out of 63,363 listings starting at $1,495
Used Ford Expedition
393 Great Deals out of 21,857 listings starting at $1,500
Used Jeep Grand Cherokee
886 Great Deals out of 71,728 listings starting at $995
Used Lincoln Navigator
96 Great Deals out of 5,080 listings starting at $1,900
Used Ford Escape
1,136 Great Deals out of 85,569 listings starting at $999
Used Chevrolet Tahoe
642 Great Deals out of 36,955 listings starting at $1,800
Used Dodge Durango
278 Great Deals out of 20,488 listings starting at $999
Used Nissan Pathfinder
320 Great Deals out of 24,168 listings starting at $2,200
Used Ford F-150
2,234 Great Deals out of 183,024 listings starting at $1,500
Used Toyota 4Runner
244 Great Deals out of 21,760 listings starting at $1,500
Used Cadillac Escalade
212 Great Deals out of 11,073 listings starting at $2,888
Used GMC Yukon
419 Great Deals out of 21,028 listings starting at $1,495

Used Cars For Sale

2010 Mercury Mountaineer For Sale
6 Great Deals out of 64 listings starting at $2,813
2009 Mercury Mountaineer For Sale
29 listings starting at $6,900
2008 Mercury Mountaineer For Sale
12 Great Deals out of 149 listings starting at $4,000
2007 Mercury Mountaineer For Sale
8 Great Deals out of 159 listings starting at $2,599
2006 Mercury Mountaineer For Sale
9 Great Deals out of 192 listings starting at $2,950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.