Carling switch wiring

[hais]

We have Carling rocker switches. I wanted to know what type, so I grabbed a multimeter - and got puzzled.

The middle yellow wire comes from CB, the white goes to load. With the master off, I see continuity from that yellow terminal to ground (frame). If CB is pulled, no continuity. Circuit otherwise works fine.

My thinking was that , if there's continuity, it must be a fault. But the breaker doesn't trip... Is this normal or should I get a shop to investigate?

[EricJ]

I don't know for certain, the wiring diagram should show how it's wired, but if the master relay is double-pole it could be arranged so that if energized it connects to the battery and if not it connects to ground.

[hais]

22 hours ago, EricJ said:

I don't know for certain, the wiring diagram should show how it's wired, but if the master relay is double-pole it could be arranged so that if energized it connects to the battery and if not it connects to ground.

Thank you, that fits the observation. 

[Aerodon]

I was totally confused on a cessna project once, getting continuity to ground when there shouldn't.  I eventually discovered the flap switch was partially down providing a path to ground even though everything else was off.

 

Aerodon

[PT20J]

It should be clear if you look at the schematic for your serial number whether it’s wired this way or whether there is a fault.

[Lois]

I recommend getting the part number from the switch and get that particular diagram from the CT website. It will help understand the circuitry’s design. 

[skykrawler]

Do they internal lights?

 

[hais]

14 hours ago, skykrawler said:

Do they internal lights?

 

They do, an LED though, not a backlight