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2024-11-27, 14:19:52
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Author Topic: Our car dead after lightning strike !  (Read 16558 times)
Group: Elite Experimentalist
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Posts: 1399
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That's quite fascinating Chris, thanks for the procedure tips  O0

I'll try it in a minute...but not on the car battery (late evening), on the old battery that's in the house.
I once had a situation where only the Positive connection of a car battery was connected to some LED's, the negative side of the LED's was stuck in the Earth. They lit up. Seemed to be a case of potential difference, but was surprising to see !



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ʎɐqǝ from pɹɐoqʎǝʞ a ʎnq ɹǝʌǝu
   
Group: Elite Experimentalist
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Posts: 1399
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A bump of this topic.

Because -
After a lightning storm our car was dead today.
Memories of the events from this thread made us again link a lightning bolt to the battery being flat. The car had been absolutely fine since that time and, only with close strikes from this storm has the problem recurred.

But here's where things get strange, after having connected a 3A laptop power supply as charger. The method works great btw when connecting the power supply to the battery with suitable 5A clip leads, a tip to pass along.
My wife turned on the lights and by doing so the clock illumination faded off.
Well, fair enough, the charger had only just gone on to the battery.
I hooked up a multimeter just to see what was on the battery, it having been at 2V or somewhere mad last year and, having disconnected the supply again. It showed 12.74V, well that was a bit odd, as it's basically correct.
So I asked her to try the ignition. Not even a click, still dead.
I then said i'd try an amperage measurement, puzzled by the 12.74V reading. She asked if that could kill the meter if it was over 10 amps and I replied yes, but it wouldn't be that high. Bit of logic huh :)
Well...on merely touching the meter leads to the battery, there was a fully charged type of crack sound and a bit of the negative meter probe got burned off !
 ???
I asked her to try the lights, they now worked.
I asked her to try the ignition again and the car started up first time !!!!

What's going on ?  :D


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ʎɐqǝ from pɹɐoqʎǝʞ a ʎnq ɹǝʌǝu
   

Group: Tinkerer
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Posts: 3055
These very weird problems are sometimes a pain but
they can be very valuable learning experiences.

How do your battery terminals and connecting wires look?
Nice and clean and tightly connected?  I had a problem
a good may years ago with a loose connector on the
negative terminal of the battery.  The car started and
ran normally until one day after turning the engine off
in order to gas up at a station.  When I tried starting to
drive off the symptom was like yours; the battery seemed
completely dead.  I was able to get a friend to give me a
push to start it and it was able to get me back home with
no problem.  There I closely examined the battery and found
the terminal connector was loose.  Tightening it up solved
this strange problem.  Ever since then I've been very
careful to assure that the terminals and connectors are
clean and tight.

But, I have had other problems too where a battery works fine
until one day it suddenly has no power and will not hold a charge.
Some batteries do quickly expire shortly after they've outlived
their guarantee period.

Well, I'm sure many readers are quite interested in your situation
and are eagerly awaiting your final explanation of the cause!



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Group: Elite Experimentalist
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Posts: 1399
... .-.. .. -.. . .-.
Thanks for writing up your experience.
The terminals are possibly a factor. They have been well attended to over the last couple of years especially. But, the positive cable is all the way adjusted and yet had been able to move. The car is now 14 years old after all. A small screw was found a couple of years back, which enabled closing the gap and pushed the whole connector tighter to the battery terminal...which has worked out very well. It's been descrewed a few times and goes back the same each time. The screw secures itself into the lead terminal as it goes in, forming a thread. Quite secure and the cable doesn't move at all. I guess the material of the screw could play into things, but it does bring the actual large round connector tight against the battery post. That pink grease stuff was applied before doing the mod and post debris hasn't been seen at all.

The car has been fine today, no issues and I don't expect any until....wait a minute...about 9pm tonight when a storm is due through LOL


We do have a theory. That is, that the car ECU locks up because of bad data, caused by the EMP of the local strike. In doing so, it only passes enough current to run an immobiliser or alarm (the car has no such aftermarket system).
When I basically shorted the battery with the meter, the electronics reset, allowing all to work fine again.


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ʎɐqǝ from pɹɐoqʎǝʞ a ʎnq ɹǝʌǝu
   
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