On Sat, 22 Apr 2017 21:15:57 +0100, Harry Bloomfield
How do you measure that? Do you have something that will log the
readings, or are you using a multimeter and Mk1 eyeball?
I'd like to measure my car's quiescent current, but the battery is in
the boot and leaving the boot open may prevent the ECU going to sleep.
I was considering putting together an arduino based current sensor
that logs to an SD card using something like this INA219 to do the
But if someone has got an off-the-shelf solution, I'd be interested to
hear about it.
I was having flat battery issues, so I wired my AVO 8 across (in
parallel with) the main bus-bar link. That way I was able to let the
car settle to sleep, then disconnect a convenient bolt connecting the
bus-bar to the main fuse panel.
Easy way is to get one of those battery disconnect devices. It fits
between the battery ground terminal and the ground lead. You unscrew a
knob to break the circuit. So you can connect your DVM across it, wait
until things settle, then unscrew the knob.
*Dancing is a perpendicular expression of a horizontal desire *
Dave Plowman firstname.lastname@example.org London SW
On Mon, 24 Apr 2017 12:23:01 +0100, "Dave Plowman (News)"
I had this very problem on an Austin Healey Sprite and after much
multimeter investigating I found that the horn was draining the
battery. I can't remeber the current draw but it was very small but
enought to prevent starting after a weeks standing idle in cold
weather. I disconnected the horn, ran the car to charge the battery,
left it for a week and it started no problem.
A replacement horn from the scrap yard was then installed and the car
continued to perform as it should for ages afterwards.
Mind you, no electronics involved in that car, but no anti-lock brakes
Problem is that charging systems are not designed to give a full
battery, so a quarter of the capacity is more likely after a couple of
years. My car cannot be left for more than 21 days according to the
manufacturer. SILs Yaris claps out after 14 days.
On Sun, 23 Apr 2017 11:06:28 +0100, "Dave Plowman (News)"
This is a 2009 Mazda 2, fairly unsophisticated I think. Last year
battery was dead flat after holiday, put it down to the age of the
battery but same again this year. Jumpered to start and went on
100mile run next day. Both events in Feb and very little if any use
in 6 weeks but just got round to measuring. So yes 40 days if battery
was full sounds about right. The 1.8 petrol Focus had no such problem
though - presumably larger capacity.
Not seeing a very good solution to this. Solar trickle charger?
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