"Ed" wrote in message
.. .
Go get a 12V relay, a 12V Power supply and a loud 12V lower current piezo.
(Actually... you can use any power supply as long as the relay matches the
power supply specs)

Wire the Piezo to go off when the AC power to the boat is OFF. (you do
this by wiring the relay to normally CLOSED and use the power supply to
keep the relay OPEN or off by hooking up the PS to the relay coil. You
wire the boats 12V battery through a tiny breaker, through the relay
switches NC and common to the piezo)

So... When the shore power is unhooked and the genset is off the piezo
horn makes a nice annoying sound until someone turns it back on. If
someone is doing this on purpose, then it may scare them... if not, somone
on the dock may notice when the noise comes on and help you figure it out.

You also may want to notify the boats around you of the new alarm and how
to fix it by turning on your breaker.

I also like the Deer camera idea to catch the guy... my friend caught a
serial "car-keyer" with one...

Nice suggestion. The small piezo would be easy to rig, and I have the
contact info for all but one neighbor.


--
"j" ganz @@
www.sailnow.com