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 of 5 people found this helpful.

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

2 of 2 people found this helpful.

Your Answer

Nissan Sentra Experts

  • #1
    L_R
    Reputation
    1,370
  • #2
    Doran Harney
    Reputation
    1,310
  • #3
    Tom Demyan
    Reputation
    1,060
View All

Related Models For Sale

Used Nissan Altima
1,012 Great Deals out of 75,707 listings starting at $1,300
Used Toyota Corolla
898 Great Deals out of 57,656 listings starting at $1,488
Used Honda Civic
796 Great Deals out of 73,925 listings starting at $1,400
Used Toyota Camry
1,045 Great Deals out of 74,331 listings starting at $295
Used Honda Accord
1,116 Great Deals out of 62,340 listings starting at $1,199
Used Nissan Maxima
284 Great Deals out of 23,297 listings starting at $799
Used Hyundai Elantra
490 Great Deals out of 43,029 listings starting at $2,295
Used Hyundai Sonata
727 Great Deals out of 50,249 listings starting at $500
Used Volkswagen Jetta
589 Great Deals out of 36,259 listings starting at $1,100

Used Cars For Sale

2017 Nissan Sentra For Sale
27 Great Deals out of 33,858 listings starting at $10,723
2016 Nissan Sentra For Sale
90 Great Deals out of 3,186 listings starting at $8,991
2015 Nissan Sentra For Sale
111 Great Deals out of 3,259 listings starting at $6,995
2014 Nissan Sentra For Sale
183 Great Deals out of 4,154 listings starting at $5,995
2013 Nissan Sentra For Sale
55 Great Deals out of 1,657 listings starting at $3,991

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.