DV> National, and I'm sure other vendors make linear regulators that are
DV> designed for automotive use.
DV> The standard 78XX or 340T-X regulators won't handle it reliably.
DV> You will need a much more robust solution for that input.
DV> The voltage across the points can be momentarily as high as a few hundred
DV> volts, and can go negative.

Ok, will a switcher regulator do this job ? Until Monday there is no
way i can find a suitable regulator like you guys suggested.
Thanks for your answers :-) I will also use a CNY optocoupler since
this is what i have near me.

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