As mentioned you do not use ohmmeter on powered circuit.
Volt meter reads voltage, ohmmeter reads resistance, and current meter reads current through the circuit.
Looking at the picture, if it were mine I would get a small screw driver or pick and clean dirt out of the switch and then spray with electric contact cleaner available at auto parts store. When it dries plug 2 halves together.
Then, according to the diagram HD2 (Head light) feeds your outside lights AND the dash light. HD2 is fed from BAT A input on the switch. So with plug connected (you may have to turn on ignition switch to feed light switch) check for voltage at BAT A on light switch. If no voltage check back through wiring toward the battery and find your open connection.
If you have voltage at BAT A with light switch on check for voltage at HD2. If you have voltage at BAT A but not HD2 you likely have a bad switch. If you have voltage at HD2 then check wiring from switch out to your outer lights. Problem should be broken wire or bad connection, burned out bulb or bad ground.
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