Depends on the truck. Some can have different switches for lights.
Our Freightliners only have 1 switch for all lights. Our Kenworths have 1 for head lights and one for the rest.
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In the 7 step method in the cdl manual it says "Turn on parking, clearance, side-marker, and identification lights." How is this different from the step above where you turn on the headlights. I thought all the "running lights" come on with the headlights and that's it. There's no other light switch.
CDL:
Commercial Driver's License (CDL)
A CDL is required to drive any of the following vehicles: