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2005 Honda Civi battery light flashing
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rickwr88
Novice
Aug 23, 2012, 7:42 AM
Post #1 of 5
(5632 views)
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2005 Honda Civi battery light flashing
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Hello everyone and Thanks for this web site.
My car is a 2005 Honda Civic 1.7 liter 215 000 KM
the battery light start flashing couple days ago. Important to said the light it is not study but is flashing. On a other forum a guy said it was impossible a battery light turn on and flash but mind do that. I know when a battery light came on it is usually mean there is a charging problem but I think my problem is not that but since I am not use to the Japanese car I truly can not find the problem by myself. I've disconnected the battery cables when the engine is running and I have measured the voltage of the battery and the voltage from the alternator and both has 13 and some volt. So I don't know what is the problem. Maybe someone can help me with it please.
Thank you for your answer.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 23, 2012, 8:02 AM
Post #2 of 5
(5610 views)
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Re: 2005 Honda Civi battery light flashing
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Don't ever disconnect the battery with the engine running unless you want to start buying some very expensive computers.
What is the voltage (exactly) across the battery with the engine running and the light flashing.
Use a digital voltmeter.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 23, 2012, 8:06 AM
Post #3 of 5
(5606 views)
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Re: 2005 Honda Civi battery light flashing
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Unless you have the factory scan tool or a high end scan tool, the wiring schematics, and system design information your going to be having a near impossible time figure this one out. I suggest you take it to a repair shop or the dealer to have it diagnosed. There are three ECUs that communicate with each other about alternator information.
Just some FYI. If you don't mind taking the chance of frying solid state devices, don't disconnect either battery cable with the engine running to see if the alternator is working or not. Doing that can send a voltage spike large enough to fry ECUs in the vehicle. You could get away with it on older vehicles that had points and carbs, but that test is outdated now. If your friends or someone in another forum told you to do that, tell them they need to update their alternator checkout procedures.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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rickwr88
Novice
Aug 23, 2012, 9:04 AM
Post #4 of 5
(5583 views)
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Re: 2005 Honda Civi battery light flashing
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Thank you guys for telling me it is mechanically dangerous to disconnect the battery when the engine running. Since I am very outdated about all this stuff, I didn't know it was wrong so thank you for this. I a have forgot to tell you the problem is intermittent. The light can flash one day and then everything is find the next two or tree days and then that happening again and that is why I didn't be able to test it when this is happening. So for sure ,I will test it when the problem will happen.
But you telling me even if I can test it, I will not be able to find the sources of the problem so I will need to bring the car in the garage anyway, it is that what you said?
Thank you for your help guys
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 23, 2012, 10:09 AM
Post #5 of 5
(5571 views)
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Re: 2005 Honda Civi battery light flashing
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Just note on disconnect battery with engine running: That is so old it pre dates me! That's old
When vehicles had generators not alternators the spinning on it produced usable electricity. Add power to a generator and it would spin. Alternators weigh less and take up less room so virtually none have been in use for decades on end. Alternators require battery power to do anything and are converting Alternating current to DCv via diodes.
Now and for a loooong time it will frustrate an alternator and with tons of electronic controls you are risking harm to complete failure of them.
Just don't do that on all common automotive systems EVER. Try to keep a good battery at all times and one more avoid using most vehicles to jump another but rather use a portable jumper box now popular so you don't stress out donor vehicle with perhaps an unknown problem with the dead one.
That test wasn't even the best way when it was safe to do that,
T
(This post was edited by Tom Greenleaf on Aug 23, 2012, 10:13 AM)
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