>   Would this be sort of how to do it?  Take power from a big source, like
> say the fan motor directly to the KC lights.  Install a good relay (and a
> fuse, of course.) in that line.  Now what?  From my newly purchased aux
> light switch..I could go to that relay..but I'd like that to only activate
> when the headlights are on high beam mode..Would I use a wire from the
> highbeam circuit and a resistor of some sort...between the switch and the
> relay, perhaps with a second relay...Lost now...

What I'd do is take power from a big source to the relay, and from there
to the lights.  Do the same with the high beams.  Take the power from the
current switch to the switch on the high beam relay, and in to the aux
light switch.  Out from there to the aux light relay.

Something like:

Battery ----------------------|---------|
   |                          |         |
   --Current light switch--|--]-High Beam relay----High Beams
                           |  |
            |--------------|  |-------|
            |                         |
            |-Aux light switch---Aux light relay---Aux lights

Mmmm... ASCII wiring diagrams

That way they only come on when the light switch is on and the high beams
are on.  If you don't turn them off at the switch, they'll go off when you
drop the brights.

It probably won't catch fire either.  Probably.

toodle pip,
--
       Dug Smith         | Terry Pratchett: It's almost
(mailto:dug@dugbert.com) |  impossible to ride a rock and roll
(http://www.dugbert.com) |  motorbike and stay on for three verses.