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23rd February 2021, 18:46 | #1 |
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Weak Horn when charging battery
I have taken a video however it won’t let me post it. But it sounds like a weak horn noise coming from the passenger side plenum drain when I’m charging my battery. I’ve disconnected it, removed and I am now charging it. But does anyone know why it makes the noise when I connect it and charge? I’m guessing the battery is dead and I’ll need a new one, however I’m worried it may be something bigger than that.
Car has been sat for about 3 weeks. Sent from my iPhone using Tapatalk Last edited by Adam2003; 23rd February 2021 at 19:40.. |
23rd February 2021, 19:24 | #3 | |
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23rd February 2021, 19:29 | #4 |
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What you can hear is probably the anti-theft horn.
Guessing about your battery is not really a productive way of assessing it. Get in on charge for a 24 hour minimum.--Leave it for a couple of hours then check the battery voltage.--You should see at least 12.4 volts which will be enough to start the engine. ( with luck that horn noise you are hearing will have vanished. ) Let us know how you get on.--- Joining the battery.---Positive first then negative. |
23rd February 2021, 19:38 | #5 | |
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Removed* that’s what I meant haha normally I just disconnect it and not remove. I’m gonna leave it on charge for the next 24 hours, try what you have suggested and I’ll report back tomorrow. Sent from my iPhone using Tapatalk |
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23rd February 2021, 19:39 | #6 | |
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Thanks Colvert, I’ll reply back on this thread after 24 hours. Sent from my iPhone using Tapatalk |
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23rd February 2021, 19:39 | #7 |
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Someone may correct me but I think some of the alarm systems have some sort of backup battery? So perhaps the car last remembers being alarmed, you've then gained entry to the car with the actual key and introduced some power to the battery resulting in the alarm?
To stop the horn sound I would try: pressing the unlock button on your fob. Failing that, pressing it rapidly several times in a row. Failing that, sticking the key in and turning the ignition on. Again someone may correct me but if the battery is that weak it may need some charging before the above works. |
23rd February 2021, 21:16 | #8 | |
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If it's chirping, it is because it's internal battery is knackered, so it's a case of either unplugging it and charging the main battery, or better still fit a decent used unit as more likely as not, you will find the internal cells will have leaked and damaged the PCB. That's why I posted the eBay link for Adam Brian |
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24th February 2021, 08:12 | #9 | |
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May well be that as battery had gone super flat to the point where I had to manually open with the key it rather than use the central locking with the key fob buttons. It’s still charging now, I left it on over night, it’s about 75% done so it was very very flat. I think the battery is on its last legs and I’m gonna need to get a new one. Sent from my iPhone using Tapatalk |
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24th February 2021, 14:49 | #10 | |
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