Left side switch (aux start)- temporarily connects house batteries to chassis battery. In case you drain your chassis battery, you can still start your engine by pulling up on this switch and holding it while you crank your engine.
To the right of my steering wheel i have switches (starting from left) - mirror heat, ICC, map lights, dash fans, radio. All switches are off or on except for ICC switch and aux start which are on as long as you hold them down.
You would push your ICC switch to flash your outside clearance lights as a "thank you" to trucks who flash their headlights to advise you it is clear for you to change back into the right lane after you pass them.
There is no emergency generator start (at least, i haven't one) for the generator if house batteries are drained.
By the way, there are two (white handle) breaker switches on the side of my 5.5kw Onan generator that are hidden from view (use a mirror on right side of genny). I got caught with that one when i lost haf my power)