[767Jockey]

My dash gauges are Smiths, using a rotary rheostat type lighting switch. Given that electrical is definitely my least knowledgeable area, I could use a bit of help troubleshooting this.

On the back of the rotary switch/dimmer that controls the gauge lighting, there are only two wires. Am I correct in thinking that if I jump across these two wires, the lights should come on if the switch is bad, effectively closing the circuit and taking the switch out of the circuit. Then, if the lights don't come on I would have to investigate further as it's likely an issue in the circuitry?