At 11:28 AM 9/12/2011, John Rodgers wrote:
>That is - can one safely operate with the one replay in place - given
>that the separate circuit comes into play only under rare circumstance?
>Or does the operation of the dimmer switch bring that circuit into play
>momentarily every time it is used?

John, you want one relay to power the low beam circuit.  You want a
second relay to power the high beam circuit.  Together, these two
relays will prevent high currents from flowing through the headlight
switch.   The switches in the column will merely direct control
current to the appropriate relay(s) and will also no longer carry heavy loads.

Yours,
David