coppiceno1
Member
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- 44
Does anyone know why my disco 200 battery light on the dash doesn't come on ,charged battery but light didn't come on
battery light not coming on
- Thread starter coppiceno1
- Start date
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nathan5346
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U checked the bulb?
coppiceno1
Member
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- 44
i think it might be alternator,because battery went flat
nathan5346
Well-Known Member
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And the battery light s'pose to come on when alternator packs up? Check the bulb
coppiceno1
Member
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yeh best go for the easy route first
martinhollings
New Member
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- newark/nottingham
there is a fault in the alternator that can cause the light not to come on when it should but still wont charge just can not rember what it is (diodes i think)
colinl
New Member
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- ashton-under-lyne lancashire
the battery light wont come on if the regulator in the alt is knackered or could be rectifier (diode pack) feeding back which also discharges the battery.Either way you need to take the alt off and have it tested.
ntfs
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- Tamworth, Staffs
Like Fanatic says, earthing the sense wire (thinner brown/yellow wire from back of alternator) with the ignition on should light the warning lamp. If not the lamp could be blown or the wire broken somewhere.
The lamp supplies the field current to provide the initial output when the alternator spins up after which the alternator provides the current through three of the nine diodes in the rectifier pack. It is quite likely that either the pack has failed or the brushes are totally worn in which case a new alternator is needed (likely if it's done a big mileage).
I had similar symptoms a while back - new alternator cured it.
The lamp supplies the field current to provide the initial output when the alternator spins up after which the alternator provides the current through three of the nine diodes in the rectifier pack. It is quite likely that either the pack has failed or the brushes are totally worn in which case a new alternator is needed (likely if it's done a big mileage).
I had similar symptoms a while back - new alternator cured it.
coppiceno1
Member
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- 44
as repied to,had to get another alternator,thanks for all the help,cheers
Hello guys - a great wee thread with lots of useful suggestions. I used the earth test to check my battery warning light - it came on. So my alternator is not charging but it is also not telling me! Don't you just love it when trouble comes in threes??? Battery done in, alternator down, and no light to tell me the wiser!
So I too am off to get me one!
So I too am off to get me one!
