Dmitriy,

Measure the voltage drop across the main ground cable between the
battery negative terminal and its point of attachment to the chassis
(I'm assuming negative ground here).  Amplitude will need to be
calibrated but signals are small and direction of current flow is
preserved.  The cable is your sense resistor; it has to be there
anyway.  This was (may still be for all I know) a common technique used
in the old uncalibrated dash displays.

Best regards,

Dave

Dmitriy Fitisov wrote:

>Hello everyone,
> I think about measuring current in car.
> The problem I see - current is big enough and impulses
> may go really high and measure voltage drop on resistor I see chalenging.
> Another thing I'd like to have -
> indication of current direction to or from battery.
> Anybody has any thoughts? Current transformator, Hall sensor (??)
> anything else?
>Thanks.
>Dmitriy Fitisov.
>
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