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Split Screen overdrive
Joined: 22 Jun 2010 Posts: 90 Location: Victoria
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Split Screen overdrive
Joined: 22 Jun 2010 Posts: 90 Location: Victoria
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Posted: Sun Aug 04, 2013 11:58 am Post subject: |
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Further testing shows there IS power at the bulb holder but still the bulb does not light up, also I now believe the two wires go together but still there is no light, its almost like it needs earthing??
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frosty moderator
Joined: 23 Dec 2003 Posts: 3832 Location: 4559 near a big pineapple, Qld
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Split Screen overdrive
Joined: 22 Jun 2010 Posts: 90 Location: Victoria
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Posted: Sun Aug 04, 2013 6:33 pm Post subject: |
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Sorry said that wrong what I meant was its almost like its not earthed.
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The Toss overdrive
Joined: 25 Feb 2010 Posts: 96 Location: Newcastle
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Posted: Mon Aug 05, 2013 10:01 am Post subject: |
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First of all stick 12V on it to make sure the globe is working. The normal connection for an ign light is between 12V from the ign switch when it is on and the field winding of the alternator. the lamp gets its earth via the field winding and regulator. When the engine is running the field winding is at the same potential as the ign power. ie the same voltage on both sides of the lamp so no glow.
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Split Screen overdrive
Joined: 22 Jun 2010 Posts: 90 Location: Victoria
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Posted: Mon Aug 05, 2013 11:56 am Post subject: |
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Toss
Yep already done all that and as I said the bulb works the and power from the ignition is reaching the light unit but still it doesn't light up. My understanding is that the yellow wire goes to the alternator and acts as an earth until the engine starts. I'm now starting to think there maybe a problem with the alternator but what I really want to know is do the yellow and white wires both go on the same terminal at the warning light, although I've tried every different combination and nothing works.
Cheers
Jim
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The Toss overdrive
Joined: 25 Feb 2010 Posts: 96 Location: Newcastle
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Posted: Mon Aug 05, 2013 3:26 pm Post subject: |
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No they don't. Like I said one side gets 12V from the ign switch , the other side gets earth from the alternator ( via the regulator and field winding )
When the engine is running this earth disappears & is replaced by the voltage from the stator which will be the same voltage as the ign voltage assuming everything is working ok. Hence no voltage difference across the globe so no glow.
If you have 12v from the ign on one side of the globe then you must be missing the earth via the field winding & regulator. I'll have a go at posting a schematic when I get time.
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Split Screen overdrive
Joined: 22 Jun 2010 Posts: 90 Location: Victoria
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