mith light setup/relay

i have both types of of switches   i have a couple oh pusg button and rocker switches  but I  don't know which one to use

thnx 

Try this out:

I just drew this up.  It should work, but I obviously didn't test it.  I got lazy on the layout (I only have access to MSpaint here so I had to cut some corners).  Relay xB and relay xC are both used for their normally closed contacts to break the latch created by the active relay.

Basically, once you turn a light on the Relay xA latches and continues to power the light (and the relay).  If either of the other two buttons are pushed its associated light and relays will energize, thus breaking the latch of the first light.

Negative sides that I see are:

1. Can't be used unless the vehicle is running (or a constant power source is added, this many relays will kill a battery pretty quick).

2. Can't turn all the lights off.  Once one light is on at least one light will remain on.  You could add a normlly closed "off" pushbutton pretty easily, but that isn't shown.

If you get away from relays and in to some 'smart' electronic controls you'll be able to greatly simplify the design.  You could possibly switch to some logic gates to simply the entire thing.