Oil switch duff? Test?

[meggles]

Just put new/used pcb in dash. Hallelujah we have warning lights, except for oil light. I used to test oil switches by putting the lead terminal to earth. I did this on the van and the oil light came on. Is this a certain sign that the oil switch is duff? Thanks in advance.

[kevtherev]

As oil switches detect pressure then that is what swtches them on and off

[meggles]

As oil switches detect pressure then that is what swtches them on and off

And therefore cause the internal switch to earth itself?

[meggles]

Sorted! Was a duff oil switch!! Thank f..