Why not use a bridge rectifier?  That way it doesn't matter which way
 it's connected.  And you can use either AC or DC.

                                            Regards,

                                              Jim



>> How much current does it have to handle?
> 
> Motor is rated 24V 250mA or something like that, peak maybe 1A. 
> 
>> 1) reverse-connected MOSFET in series with battery, biased so 
> 
> I'll try that.
> 
> Wouter van Ooijen
> 
> -- -------------------------------------------
> Van Ooijen Technische Informatica: www.voti.nl
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>  
> 
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