Simon F27
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| posted on 5/4/06 at 08:11 PM |
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Ignition Light
I am having an issue getting my ignition light to come on when the igniton is turned on. I have a switched supply from the barrel to the light and the
other pin is supplied by the alternator charging wire which is brown with a yellow tracer. I am getting 12v to the light from the swithced feed and 12
v from the alternator charging wire, but no light. Any ideas, this is really starting to baffle me.
cheers
Simon
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MkIndy7
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| posted on 5/4/06 at 08:21 PM |
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Yup, your feeding it with two +'ve feeds, its never goint to light up.
You need 1 or both +ve's to 1 side of the light and earth or -ve to the other
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nitram38
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| posted on 5/4/06 at 08:42 PM |
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The terminal from the alternator needs to be negative when the engine is not running and positive when the engine is running.
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flak monkey
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| posted on 5/4/06 at 09:18 PM |
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The terminal from the alternator is a switched negative. Hence being a brown wire with coloured trace.
The positive side of the light is right (should be on the switched feed from the ign switch). Are you sure you are connected to the right terminal on
the alternator?
Cheers,
David
Sera
http://www.motosera.com
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RazMan
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| posted on 5/4/06 at 09:19 PM |
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quote:
Originally posted by MkIndy7
Yup, your feeding it with two +'ve feeds, its never goint to light up.
You need 1 or both +ve's to 1 side of the light and earth or -ve to the other
Pretty sure that is wrong - the bulb has +ve both sides and remains off when there is no potential difference between the two +ve feeds. If the
alternator stops for any reason then the bulb will light.
Are you certain that both feeds are switched ignition feeds? Also the alternator connection should be on the 'lamp' terminal
*edit* damn Flak beat me to it 
[Edited on 5-4-06 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Dusty
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| posted on 5/4/06 at 10:38 PM |
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Sound like it is wired OK. Not a blown bulb by any chance?
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MkIndy7
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| posted on 6/4/06 at 12:27 AM |
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Raz, Surely an Earth/-Ve needs to be provided from somewhere, just the removal or switching off of a +ve is not enough to light a bulb?
Unless when it switches off it becomes a -ve somehow, in which case the suggestion that it is coming from the wrong terminal sounds the most likey.
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RazMan
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| posted on 6/4/06 at 07:01 AM |
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quote:
Originally posted by MkIndy7
Raz, Surely an Earth/-Ve needs to be provided from somewhere, just the removal or switching off of a +ve is not enough to light a bulb?
Unless when it switches off it becomes a -ve somehow, in which case the suggestion that it is coming from the wrong terminal sounds the most likey.
That's it precisely - the alternator lamp connection reverts to an earth when there is no charging current, therefore current is then allowed to
flow through the warning lamp. 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Simon F27
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| posted on 6/4/06 at 05:50 PM |
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I have put the borwn and yellow trace wire on the buld side but still no joy. The brown and yellow on the alternator side is part of a multi plug so
no way og connecting it wrong. Confused still
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theconrodkid
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| posted on 6/4/06 at 05:54 PM |
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earth the small(ind) wire or poke a circuit tester up it,the dash light should glow.
if not its a bulb/wire prob
who cares who wins
pass the pork pies
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Marcus
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| posted on 6/4/06 at 06:20 PM |
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Isn't the charge light wire usually blue?
It is on my Lucas equipped crossflow.
Marcus
Marcus
Because kits are for girls!!
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MkIndy7
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| posted on 6/4/06 at 09:25 PM |
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You could continuity test the Bulb to prove that works, or even wire it direct to the battery to prove it Illuminates.
It is a bulb isin't it, and not an LED that could have the polarity wrong?
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Simon F27
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| posted on 7/4/06 at 05:50 AM |
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I have checked the buld works by earthing it and it lights up fine. It appears not to be getting the earth that it requires from the charging
connection.
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theconrodkid
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| posted on 7/4/06 at 06:42 AM |
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there is no earth in alternator then,has it been standing around,sometimes a good spin to un-lock the brushes will work,is the body earthed,failing
that its an alternator prob
who cares who wins
pass the pork pies
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MkIndy7
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| posted on 11/4/06 at 10:17 PM |
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Do we have an answer yet?
Its always nice to know there outcome when somebody finally sorts it.
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02GF74
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| posted on 12/4/06 at 08:22 AM |
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quote:
Originally posted by Simon F27
I have put the borwn and yellow trace wire on the buld side but still no joy. The brown and yellow on the alternator side is part of a multi plug so
no way og connecting it wrong.
wire colours may not mean much as they can be different between makes. Also you do not say which alternator it is.
There are two main type, ones with a multi plug - mainly Lucas. These have three spades on the alternator; two big ones, 6,8 mm, usually connected
together for the alternator output. Once smaller, 4.7 mm, is the field coil supply and goes to the lamp.
When alternator is not running, this small spade is at ground so current flows through your bulb and it lights up. When alternator runs, the voltage
on the spade is same as output voltage, i.e. 13.5 V, hence there is not voltage drop across the lamp so it does not light up.
The other type uses scew type terminals; these a lablelled with letters - you need to search that info. youself.
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