Hi:

Thanks for the responses. The load is a very quiet water pump. It draws
between 5 and 40 amps depending on water load. We need to know not just when
the on/off breaker is activated, but when the pump is actually on and
drawing battery load. The circuit will drive an indicator lamp via a relay.

I have some small reed relays, do you think a coil of the pump's feed wire
will trip it to make contact? That would be easy.

Thanks


"jon doe" wrote in message
...
Hi:
Looking for a simple circuit idea that will tell us when a 12V DC load is
activated. This is a critical load so we don't want to do anything that
will
make it unreliable. The circuit just has to activate a tiny relay when the
load is going. Any ideas?
Thanks