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How does the battery warning light work? The previous owner removed the bulb so I put one back in and the light stays on (which is obviously why he took it out). Im assuming this is because the battery checking system isn't connected as my battery is fine. But where is this? how does it work?
it also comes on because its
it also comes on because its not charging, i.e alternator fault, but if it is charging then youve obviously got a wiring fault somewhere or regulator issue or.....
Full of ideas but no time to do them!!
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I don't have an alternator or
I don't have an alternator or battery problem the light comes on because I don't think the system is connected. Im interested to know how it works as I may reconnect it. Is it a direct voltage feed from the battery? i.e once voltage drops the light comes on.
1981 Daihatsu Scat F50
Gold Coast Australia
are you 100% sure that the
are you 100% sure that the alternator is charging?? as the warning light works via the alternator.....
Full of ideas but no time to do them!!
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Hope this helps
Elblado,
My knowledge is very limited and this is how it was described to me once, but here goes anyway. Bear in mind that this is the basic way it works, and should there be a computer in the loop I am stumped. I am not an auto electrician.
There is a live wire from the ignition switch to warning light bulb, and a wire from other side of bulb to alternator, (or in older cars a dynamo). So when you switch on the ignition, you get a live feed to the warning light bulb, and the stationary alternator/dynamo acts as an earth, so the bulb lights up. OK so far.
When you start the engine, the alternator also gives out a live feed and cancels out the feed from the ignition switch that is lighting the bulb, so the bulb is now getting a live feed from either side, (no earth) and goes out. Voila.
If as you say the battery is fine and you are not having any actual charge problems, then, using the above, it appears you have a break in one of the feeds to the warning bulb. If the warning light comes on before the alternator is running it narrows it down to alternator feed side - i.e. the ignition side must be good. If the warning light comes on after the alternator is running it is vice versa.
Hope it makes sense. Just remember this is a very basic system description.
Good luck
Regards
Spot on description of how it
Spot on description of how it works.
But, the question remains of how the alternator is being excited if its not wired through the ignition switch ans warning light. Obviously it has a permanently live connection to it, or another ignition feed which does not run through a warning light.