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Discussion Starter #1
Hey Y'all I have a 1992 Stanza.

The Battery Light comes on when I accelerate(hard). I am the third owner of the stanza. I checked the service record(carfax) and noticed that the alternator has been replaced twice. Once at 67,438 and the second time at 69,847 (Also had Belts(s) Replaced). I currntly have 84,000 miles what could be the issue?

Thank you in advance.
 

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Sup Mod keeping the peace
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A properly working charging system puts out about 13.2 to 15.0 volts, but this is a general spec. and the factory service manual (FSM) should be referenced for the correct charging system voltage specifications for a particular vehicle. A battery should have a static charge of 12.2-12.6 volts. If a battery is not good, the charging system may not be able to charge properly. If a vehicle is not charging properly and the battery is good, first thing to do is to turn the ignition switch key to the "ON" position and make sure the charging system warning light is operating. If the bulb is burnt out, the charging system will not charge. If the bulb is OK but still does not illuminate, the circuit must be tested. If the warning lamp does illuminate, then the next thing to check is to make sure the circuit between the battery positive post, or fusible link, to the connection in back of the alternator is good. On Nissans, this will be a thick (approx. 10 gauge) white wire to the "BAT" post on the back of the alternator. It's not uncommon for this wire to get corroded and burn up, creating resistance in the circuit. So, before assuming an alternator is bad, make sure this circuit is good and battery voltage is getting to the alternator. It's also important to make sure the alternator belt is tight and not slipping and the battery connections are clean and tight. Also, it is NOT a good idea to disconnect a battery cable on a computer controlled vehicle while running to test the alternator. This is a good way to damage an ECU. When a charging system is not charging, or overcharging, a lot of "strange" things can occur. It's not uncommon to see a multiple of stored trouble codes in the ECU memory. So, whenever a car is setting a multiple of trouble codes, idling funny or stalling, or anything out of the "norm," test the charging system before you start pulling hairs!

If you find the alternator to be bad, replace it with an OEM rebuilt unit; even though they are more expensive then the aftermarket types, at least they'll last for a good number of years. Most aftermarket types are poor quality and don't last very long; sometimes they're even DOA.
 

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Discussion Starter #3
Thanks for getting back to me so quickly. That was a lot of information to go through, but it was very infomative
 

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NF Mod/Nissan Master Tech
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To add on the info below, the charging system should be checked at idle and at 3000 RPM, both with loads "on" and loads "off" (A/C, lights, defogger, etc.).
 
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