Battery light comes on when car stopped and idling.

Asked by Oct 10, 2009 at 07:59 PM about the 1994 Nissan Sentra XE

Question type: Maintenance & Repair

I have a 1994 Nissan Sentra (automatic with 77,000 km.)and just replaced the battery and alternator this week.  Problem is, when I'm stopped and the motor is running, the red warning battery light comes on.  Once I accelerate, it goes off.  What could be the problem?

2 Answers

105

Voltage Regulator. I don't know what it looks like on an 94 Sentra, but you should replace that. They are not too expensive. If you have a voltmeter you can test it. Check the battery voltage when the engine is not running. The voltage should be a little over 12 volts dc. Start the engine. If it isn't real hot outside, the voltage should go up to between 13 and 14 give or take. If it stays close to 12 your voltage regulator is bad. If that doesn't fix it then maybe you have a bad connection in the charging system. Check the following for corrosion and or damage: 1) alternator positive to battery positive, 2) battery negative to chassis, and 3) engine ground to chassis. If none of that works, well, brand new alternators have been known to be bad right out of the box.

5 people found this helpful.

see if you can raise the idle a little bit, the engine isn't spinning fast enough.

2 people found this helpful.

Your Answer

Nissan Sentra Experts

  • #1
    L_R
    Reputation
    1,440
  • #2
    Doran Harney
    Reputation
    1,400
  • #3
    Tom Demyan
    Reputation
    1,160
View All

Related Models For Sale

Used Nissan Altima
714 Great Deals out of 69,652 listings starting at $950
Used Toyota Corolla
566 Great Deals out of 67,649 listings starting at $1,495
Used Honda Civic
360 Great Deals out of 52,697 listings starting at $1,200
Used Toyota Camry
768 Great Deals out of 71,356 listings starting at $1,200
Used Honda Accord
449 Great Deals out of 102,531 listings starting at $800
Used Hyundai Elantra
463 Great Deals out of 49,226 listings starting at $495
Used Nissan Maxima
207 Great Deals out of 17,148 listings starting at $1,900
Used Hyundai Sonata
360 Great Deals out of 49,710 listings starting at $1,250
Used Volkswagen Jetta
403 Great Deals out of 25,040 listings starting at $1,800

Used Cars For Sale

2018 Nissan Sentra For Sale
4 Great Deals out of 29,057 listings starting at $11,290
2017 Nissan Sentra For Sale
94 Great Deals out of 7,259 listings starting at $9,998
2016 Nissan Sentra For Sale
85 Great Deals out of 3,906 listings starting at $7,745
2015 Nissan Sentra For Sale
99 Great Deals out of 3,303 listings starting at $6,495
2014 Nissan Sentra For Sale
97 Great Deals out of 2,959 listings starting at $5,900

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.