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Rod Speed Rod Speed is offline
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Default Lead acid battery charger (or alternator) switching to trickle with load present?



"Commander Kinsey" wrote in message
news
On Fri, 12 Jul 2019 20:52:51 +0100, Rod Speed
wrote:



"Commander Kinsey" wrote in message
news
On Fri, 12 Jul 2019 20:02:36 +0100, Rod Speed
wrote:



"Commander Kinsey" wrote in message
news On Fri, 12 Jul 2019 18:31:44 +0100, Rod Speed

wrote:



"Commander Kinsey" wrote in message
news On Fri, 12 Jul 2019 01:20:46 +0100, Rod Speed

wrote:



"Rod Speed" wrote in message
...
It cant be a fused line given that you still get
the battery flattened with no fuses installed.

If you can somehow rig up something that allows you to
see or hear the current draw, or have someone else watch
the meter, you may be able to see if its a door by doing
that and operating the doors.

I've only ever seen it by leaving a multimeter connected with a
maximum
function running. Car sat perfectly still, it just does it
sometimes
overnight.

Yeah, you really need a proper data logger. Not expensive.

Not spending money on stuff for one little purpose like that.

But you did with the charger to kludge around the fault.

A 13.8V 15A power supply is very useful for all sorts.

And you should be able to flog it for about what you paid
for it once it has fixed the problem.

Too much hassle and I lose postage and Ebay fees etc. Only time I've
bothered "renting" something like that was a top of the range slide
scanner for a large amount of 35mm slides I wanted digitised.

And I can't see it would tell me anything, apart from "it happened at
5am".

When it happens and the detail of how it happens
may well allow you to work out what is causing the
flattening of the battery overnight and fix the problem.


What can it tell me apart from the time of night it did it?


How long that high current lasted for. That would definitively
distinguish between the alarm being triggered and eventually
timing out and a pinched wire which would have quite
different timing, particular over different nights.


I know it's a long time as it can flatten the battery.


But you dont know if its continuous when it happens
or intermittent. If it was intermittent and regular it
could well be the alarm triggering, then timing out,
the triggering again and then timing out again etc.

You wouldnt normally get that with a pinched wire.

And that would allow you to see which door is the problem
too if it is one of the doors pinching a cable as its closed.

What makes you think it's a door?

Its the most obvious way to pinch a cable.

Actually I've just had an ABS wire fixed that had been damaged by the
handbrake.


Sure, I didnt say its the only one. And that one wouldnt
be fused either. Neither would the airbag triggers.


Airbags certainly are fused.


Mine arent.

I know people who have taken the fuse out.


But you dont know its fused in your steaming turd with wheels.

It happens randomly overnight when nothing has been moved.

But the change in the metal around the door may well
happen as the ambient temperature changes overnight.

I won't know which door from the reading from the data logger.


Yes you would from when you opened and closed a particular door.
And you could do the other movable stuff like the bonnet, boot,
hand brake etc too.


Not with a that intermittent fault.


If you do see the 4A current, you will know that door or other
thing like a handbrake did it if its only seen with that door and
it would be trivial to only exercise that door etc once you first
see that it happens with that door to get it to happen again
even if it only does that intermittently.