How do you replace headlight switch on mack chu 613?

To replace the headlight switch on a Mack CHU 613, start by disconnecting the battery to ensure safety. Next, remove the dashboard cover if necessary to access the switch. Disconnect the wiring harness from the old switch, then unscrew and remove the switch from its mounting. Install the new switch by reversing the process, ensuring all connections are secure before reassembling the dashboard and reconnecting the battery.