Suspect aternator V belt needs tightened and/ or replaced.
The light is dimly lit when you measure 14V?
It is a V belt, yes then with engine off if you can turn the alternator pulley by hand and it slips on the belt, then it is not tight enough.
Apparently the 93 Nissan has a "bulb check" relay that is wire OR'd with the batt fault indicator. Locate and remove to see if problem clears.
Testimonial: "It's not the alternator belt, I put a new one on it plus the vehicle charging voltage is over 14 volts . I'm thinking it's something in wiring but not sure on that ."
SOURCE: 1997 Nissan Altima problem
Check your battery fuse mine just also did that and it was the fuse under the hood. Location of fuse box is by the battery and it should be the big fuse close to the middle
SOURCE: 94 nissan pickup se how to reset check engine light
disconnect the negative battery cable re hook it back on.. this is only a temp solution if there is a problem it will come back on in the next 100 miles
SOURCE: 1999 nissan sentra gxe headlight problem
do you have the right light bulb? i own a 98 sentre and
it takes a 9004 bulb, but walmarts computer said to use 9007. That made the high beam censor stay on till i replaced it. if you look at the bulb you can tell if it is a dual or single beam bulb.!!!!
SOURCE: issue with dash lights dimming while driving,
If the battery and alternator tested fine. I would have the charging system rechecked when engine is hot and at high rpm's. This way the checks are being done as if you were driving and driving for a long time. Alternators can work fine when cold but weaken when hot or stop working. This problem is not rare but only is seen occassionly. Unless it was checked at an electrical shop the average shop doesn't run these tests for they don't see the problem often enough to automaticly run them at all times. Good luck and let me know how you make out.
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