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Discussion Starter #1
Having some issues, my car has almost 300,000 miles on it. My problem is that the alternator light will flicker alot, at times has a rhythm to it that matches the vibration the car itself has, or not do it at all. Also, it will have a miss or stumble when driving at times. I have checked the cables at the battery, checked the wiring at the alternator. What else should I check for?

Thanks.
 

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09 Altima 3.5SE 6MT Sedan
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7,040 Posts
Your year is well known for rotted ground cables (where they attach to the chassis and particularly the transmission, not at the battery). You're probably 150Kmi overdue for replacing your -ve cable. :)
 

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Discussion Starter #3
I have replaced the Battery cable, and ran new ground wire from the trans to the chassis, but it has been a few years, will double check. Also, where are all of the chassis grounds at? I pulled the engine a few years ago, and only remember 1 ground to the chassis.

Thank you.
 

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Altima FTW
ASE Certified Master Technician & Advanced Level Specialist
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963 Posts
What is battery voltage reading when the light flickers?
 

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Discussion Starter #5
It reads 14+ volts, either my volt meter can't see the voltage drop fast enough or it my average the voltage, not sure.

Thanks.
 

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09 Altima 3.5SE 6MT Sedan
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7,040 Posts
Your meter only samples once or twice a second. A glitch 10x smaller than that will cause your ECU to freak out.

If the connector/wiring/internal regulator at/to the alternator has an intermittent connection this would cause the light to flicker (as it is driven direct from the alternator) and it could also cause engine performance issues as the load the alternator puts on the engine is controlled by the voltage it senses...so a glitchy connection at the alternator (or in the wiring to) could cause the light to flicker, and each time it flickers the charging power supplied by the alternator flickers, which also causes the engine load to 'flicker'. A shake in the engine could mechanically feedback into the faulty wiring/connector and cause more flickering. A bit of a WAG (but a good story!) given the limited data points so far, but the fact that the voltage was reading in the 14V range seems exclude overcharging as a possible cause.
 
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