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Discussion Starter · #1 ·
Hi fellows. As the title says, my battery light comes on at higher revs, yet a check revealed that the alternator is charging the battery. What could be the cause of this?
 

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nissan patrol gq
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Check if it's charging when the lights on, if not then the brushes may be worn out, or you have a faulty exciter diode in your rectifier plate causing the regulator to pull it's power through the warning light circuit when at higher rpm due to the higher output.
 

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Discussion Starter · #3 ·
Check if it's charging when the lights on, if not then the brushes may be worn out, or you have a faulty exciter diode in your rectifier plate causing the regulator to pull it's power through the warning light circuit when at higher rpm due to the higher output.
The electrician did pull it down and told me I needed an exciter light. I couldn't find out what that was. Can that cause any damage otherwise.
 

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nissan patrol ti v
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That would be the exciter diode trio (as above), meaning the alternator isn't self exciting (charging).
Won't cause any other damage normally.
Cheers,
 
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