Look into the hall effect current sensors from allegro.
http://www.allegromicro.com/sf/0750/

Very low insertion loss, currents to 100A, isolated output, magnitude and
direction information out.

-Denny


> 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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