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Home > Help Needed / General Tech Chat > Alternator/Ignition Light Issues

carts60

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Member #: 9335
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Bromley, SE London

4th Mar, 2012 at 02:01:57pm

So I'v got a problem with my alternator or the wiring it connects to.

The issue is basically the ignition light doesn't go off once the car has been running and i'v looked at all the possible options I can think it might be thats causing the issue but they all seem to be fine in their own right.

The battery is new and is accepting charge, battery terminals are good and greased, all earth connections are good. The wiring harness to the alternator is also good with no splits in the wires and the earth connection on the alternator itself is fine too.

I should say the alternator has also been checked on another mini to make sure its actually charging and a good unit.

I'm totally stumped?? Ideas would be much appreciated

apbellamy

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King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner

Rotherham, South Yorkshire

4th Mar, 2012 at 02:04:06pm

There's a brown/yellow wire that runs from the alternator to the plug for the clocks. Use a multimeter to check continuity.

On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it

*hehe!*

carts60

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259 Posts
Member #: 9335
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Bromley, SE London

4th Mar, 2012 at 02:09:23pm

I'm fairly sure there is continuity and its not the wire to the plugs because my voltmeter shows the car isn't charging when the car is running.

I think i'm correct in making that assumption?

apbellamy

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16540 Posts
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King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner

Rotherham, South Yorkshire

4th Mar, 2012 at 02:15:34pm

Is the alternator plug on your loom clean? Especially the terminals.

On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it

*hehe!*

carts60

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259 Posts
Member #: 9335
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Bromley, SE London

4th Mar, 2012 at 02:17:53pm

yes. its something i can check again though just in case

Brett

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Doncaster, South Yorkshire

4th Mar, 2012 at 02:21:05pm

the alternator grounds out the said wire when it is not charging,
apply a voltage/current to this wire and it will start charging (engine running)
when it is charging the alternator supply's 12v to the wire
this cancels out the voltage difference across the bulb in the dash and the bulb goes out

if the bulb is coming the wire to the alt has continuity then the problem must be with the alternator

Yes i moved to the darkside *happy*

Instagram @jdm_brett


carts60

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259 Posts
Member #: 9335
Senior Member

Bromley, SE London

4th Mar, 2012 at 02:33:31pm

So if the light is on, it must be the alternator? Can it possibly be anything else?

carts60

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259 Posts
Member #: 9335
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Bromley, SE London

4th Mar, 2012 at 02:35:05pm

what im getting at is that can a break in the circuit somewhere not also be a problem - I take it the ignition light would not come on at all if there was a line break

apbellamy

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16540 Posts
Member #: 4241
King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner

Rotherham, South Yorkshire

4th Mar, 2012 at 02:46:59pm

The ignition light gets 12v from the dash when you turn the ignition on

On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it

*hehe!*

Brett

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Doncaster, South Yorkshire

4th Mar, 2012 at 03:31:54pm



On 4th Mar, 2012 apbellamy said:
The ignition light gets 12v from the dash when you turn the ignition on

and is earthed at the alternator when its not charging, if the light comes on at all, there is no problem with the wires assuming they go to the correct place and the bulb obviously works
the issue is the alt not charging voltmeter across the battery will confirm this
On 4th Mar, 2012 carts60 said:
I should say the alternator has also been checked on another mini to make sure its actually charging and a good unit.

youve said this alternator worked fine in another mini if it does im 100% stumped and can only suggest trying the other minis alternator in your mini and if that doenst work either im 200% stumped :)

Edited by Brett on 4th Mar, 2012.

Yes i moved to the darkside *happy*

Instagram @jdm_brett

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