[Bigdav160]

35 milliamps will draw down a battery to the point the vehicle won't crank in less than 4 weeks. (depending on reserve capacity rating)

But 35 milliamps isn't .003 amps. Which is it?

I have a one wire alternator on my boat. It came that way from the factory. I haven't noticed any parasitic drain so I haven't bothered to measure it.