elec problem with 2008 Mustang

Asked by Mar 06, 2017 at 01:01 PM about the 2008 Ford Mustang

Question type: Maintenance & Repair

Even w/New batt & alternator - battery won't stay charged.  While running, radio quits, dash instru. turn off, and car stops (total elec. system failure).  Can this be result of Shaker 500 radio/stereo - or is the new alternator bad?

1 Answer

50,855

Measure the voltage at the battery terminals with the engine running. It should be somewhere between 13.5 and 14.6 volts plus or minus a tenth or two. If it is less the alternator is not charging. The ECU tells the alternator to start and stop the charging. If it is not charging the wiring needs to be checked at the alternator and the big wire should be hot to the battery positive even with the key off. It sound like the battery is draining and shutting off the car. Also check the battery connections at the battery and at the starter. These connections need to be clean, free of corrosion and tight.

Your Answer

Ford Mustang Experts

  • #1
    Tom Demyan
    Reputation
    4,540
  • #2
    Bob Beaman
    Reputation
    1,250
  • #3
    COMETGUY61
    Reputation
    1,090
View All

Related Models For Sale

Used Dodge Challenger
8 Great Deals out of 886 listings starting at $12,888
Used Dodge Charger
103 Great Deals out of 808 listings starting at $1,999
Used Chevrolet Corvette
704 listings starting at $4,450
Used Ford Shelby GT500
22 listings starting at $35,995
Used Ford F-150
442 Great Deals out of 9,125 listings starting at $3,000
Used BMW 3 Series
162 Great Deals out of 1,893 listings starting at $2,300
Used Jeep Wrangler
98 Great Deals out of 1,570 listings starting at $1,988
Used Chevrolet Silverado 1500
185 Great Deals out of 10,686 listings starting at $2,500
Used Nissan 370Z
11 Great Deals out of 170 listings starting at $17,988
Used Honda Civic
309 Great Deals out of 4,018 listings starting at $1,411
Used Nissan 350Z
25 listings starting at $11,484
Used Honda Accord
54 Great Deals out of 1,096 listings starting at $1,200

Used Cars For Sale

2017 Ford Mustang For Sale
418 listings starting at $25,900
2016 Ford Mustang For Sale
134 listings starting at $25,900
2015 Ford Mustang For Sale
92 listings starting at $21,995
2014 Ford Mustang For Sale
163 listings starting at $16,888

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.