Hi. If you have a possible problem with the battery, try disconnecting
the battery (and remove from the car if convenient) just charge via a
mains charger and then check the voltage after a good charge and over
a period of time after. If it goes down to below 12V sitting over a
day or two it is shot. You cannot get a real view of the battery
while connected it may be a drain from the car. This has worked for
me with cars and the canal boat. (four batteries in two banks!)
Alternatively, try and see what AMPs are flowing out of the battery
when everything is switched off. You may need to read the manual with
your meter to see how to connect this or even if your meter is
suitable. But would be in line between one terminal and the lead, not
across the two battery terminals. There may be legitimate drains on
the battery. e.g. a car alarm or an interior light on. I have had a
failed light switch before so the boot light was on all the time. I
traced it that way.
If you are checking the battery the first way is really the business.
That way you can really confirm it's OK. Alternatively your can take
it to a specialist who will test it under load and see if it is weak.
The second way is more for car fault finding.
Derek
On 24 May 2010, at 20:39, Susan and Martin Scott wrote:
I've now had a second battery replacement, and have therefore come
to the conclusion that it may not be a fault with the battery. The
last time it drained to nothing in 2 days (and it was absolutely
nothing, not even enough to light an LED!). I immediately detached
the terminals and found there was no resistance - indicating nothing
in circuit?
Although I'm confident with simple circuits, I'm the first to admit
that electronics is beyond my brain power................. I set
about some detective work today
Findings 1. With meter set on ohms, I get no reading across the
battery terminals when disconnected from the battery and nothing in
circuit.
2. With the battery terminals connected and the engine running
the voltage across the terminals is 13.7V
3. Without the engine running the voltage across the battery is
12.6V
4. With the battery terminals disconnected and the meter set to
2V, I found there was a voltage of 0.048V when the meter was
connected, which reduced to level out at 0.015V. It didn't seem to
matter when the meter was connected ie If I measured across the
terminals 3 Sec after disconnecting from the battery it was the same
as if I waited 2 minutes, and also the drop once the meter was put
across was delayed if interrupted eg . 0.048 then watch it drop to
0.030, remove meter for 5 seconds, reconnect meter and the reading
was 0.030, then dropped further.
5. Having removed all the fuses, the same occurs.
The alarm fuses have been disconnected as well, but I don't
think it has a battery in it.
6. Connecting the meter between the engine block and the
positive battery terminal measures a lower voltage 0.028V, which
drops to the same 0.015V
Is it maybe electrolytic reaction within the block? As I say I'm not
into electronics.
Why is there no measured resistance, but the battery drains?
Any ideas gratefully received.
Martin
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