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Old 16th April 2021, 19:18   #1
rover_ed
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Default Battery light

Having issues with the battery light going mad have good voltages in battery and i replaced alternator but its still going crazy 1.8t
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Old 16th April 2021, 21:41   #2
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Is the voltage holding steady at the battery terminals with the engine ticking over.--( around 14 volts. )

If it's not then the fault might be with the alternator---



PS. I like that technical description of the dash light----Going crazy--Guess that could mean anything.--
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Old 17th April 2021, 05:22   #3
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Readings are steady running its 14.3 when sat at idle i dont come on rrev it or driving then it starts flickering on and off
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Old 17th April 2021, 10:00   #4
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On stable at idle but flickering at higher engine speeds can suggest a couple of things, one being a poor connection some where that is affected by engine vibrations another is that the brushes are worn down to the limit, contacting the commutator OK at idle but not at higher revs, at their wear limit, the spring is still applying pressure but the brush ' tail ' prevents full positive contact with the com and the brush tends to skip, for a better word, making intermittent contact.


This normally cant be seen with a conventional DVM but can be seen on a scope.
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Old 17th April 2021, 16:32   #5
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If the brushes are worn down to the limit then they need to be changed ASAP. Flickering can be caused by arcing between the end of the brush and the slip ring commutator causing the slip ring to burn away.---
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Old 17th April 2021, 21:01   #6
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Alternator is new all leads and earths are tight and clean and battery voltage are ok
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