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

49,195

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

Add photo

Related Questions

  • elec problem with 2008 Mustang 1 answer

    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/stere...

    2008 Ford Mustang

    -

    Maintenance & Repair

  • Mustang electrical problem 2 answers

    Have a 2000 mustang ft 4.6l. My positive wire for my sub woofers grounded out on my frame. The car acts like it has a dead battery now. When the key is off the door bell will ding but as soon as I ...

    2000 Ford Mustang GT

    -

    Maintenance & Repair

  • 2008 Ford mustang cuts off while driving 1 answer

    I have a 2008 mustang 4.0 and I'm having a lot of issues. After the car runs for a while it will sputter and cut off. The fuel pump will not come on until after sitting a while. Then it will run fi...

    2008 Ford Mustang

    -

    Maintenance & Repair

  • Ford Mustang Starting Problem 2 answers

    I have Mustang 2014 V6. I had a starting problem. I tried to start, but there was no sound. Radio , lights etc. everything was working but car not. After try second or third times than it started as...

    2014 Ford Mustang V6

    -

    Maintenance & Repair

  • Mustang convertible problem 2 answers

    I have a 2010 ford mustang convertible I was driving on the highway round 85mph and the convertible flew open. From what I was told is the two side pieces are bent out of place. It will go down bu...

    2010 Ford Mustang V6 Convertible

    -

    Maintenance & Repair

Search Ford Mustang Questions

Ford Mustang Experts

#1 Tom Demyan
Tom Demyan
Reputation 4,500
#2 Bob Beaman
Bob Beaman
Reputation 1,240
#3 COMETGUY61
COMETGUY61
Reputation 1,090
View All

Related Models For Sale

Used Dodge Challenger
4 Great Deals out of 1,047 listings starting at $12,487
Used Dodge Charger
84 Great Deals out of 901 listings starting at $2,000
Used Chevrolet Corvette
668 listings starting at $4,450
Used Ford Shelby GT500
26 listings starting at $34,994
Used Ford F-150
385 Great Deals out of 9,861 listings starting at $1,500
Used BMW 3 Series
183 Great Deals out of 1,996 listings starting at $1,500
Used Jeep Wrangler
81 Great Deals out of 1,483 listings starting at $6,995
Used Chevrolet Silverado 1500
134 Great Deals out of 9,153 listings starting at $100
Used Nissan 370Z
6 Great Deals out of 188 listings starting at $15,500
Used Nissan 350Z
24 listings starting at $9,450
Used Honda Civic
363 Great Deals out of 4,457 listings starting at $999
Used Honda Accord
95 Great Deals out of 1,213 listings starting at $1,888

Used Cars For Sale

2017 Ford Mustang For Sale
489 listings starting at $1,000
2016 Ford Mustang For Sale
151 listings starting at $21,995
2015 Ford Mustang For Sale
100 listings starting at $21,995
2014 Ford Mustang For Sale
157 listings starting at $16,750

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.