On Sun, 15 May 2005 23:57:08 GMT, "Roger Long"
wrote:

Oh of course. Like this, right?

http://home.maine.rr.com/rlma/Switch.jpg

(I loaded the new sketch into the same URL)

I remember now the big fog lights I had on a car years ago. There was
a relay under the hood so all the juice for the big lights wouldn't be
running through the tiny switch in the panel. The relay was pretty
well sealed and intended to survive under the hood of a car so should
do pretty well if kept above the bilge water. I'll look for a couple
of those tomorrow.


Now, you're talking.
1) Make that a 12 volt relay with two normally open
20A DC rated switches
2) Dedicate one switch to the pump supply.
3) Add a snubber of 10 ohms in series with 0.01 microfarad (200 volt +
working)
across each of the two inductive pieces, which are
3.1) the relay coil
3.2) The motor inputs

4) Remember that sparking contacts in the vicinity of a gas
tank/engine make loud noises, so a metal clad relay would be better,
in a decent blade socket.

Brian Whatcott Altus, OK

Brian Whatcott Altus OK