I notice it isn't on some switches nor on any of the diagrams I've looked at but there is one on the switch I'm refurbishing. Any particular use?
I used it one time when I rewired the car. I went through 4 fuses before I found out that the ground was causing a direct short. I think it is like a lawn mower wire that shorts out the ignition to stop the motor. Do not use it.
Thanks. I didn't use it. Just wondering why it was there to begin with?
The April 1 1920 Service Bulletin notes the 'Grd' terminal is used when testing the switch, with all harness removed from the switch. 110v test lamp is put to the ground to see if there is a ground issue with the three positions of the ignition ( Bat, Off, Mag ) of the switch.
Not every mfg. did that Grd terminal on the switch so some don't even have it.
Normally never used to ground the switch to the chassis, as the metal dash panel the switch is mounted to does that if needed, but grounding the switch plate isn't nescessary.
Hmm, if you have an aftermarket wood body with the little metal "dash plate" that holds the switch and ammeter, maybe that's when it would be used, as the plate is usually fastened to a piece of wood.
er saw one with a grnd. terminal. Even with a wood mounting would a grnd. be necessary on the ign. switch?
The switch is isolated, only passes voltage from one side, when contacts mate, no ground needed. Lots of depot hacks made with wood panel that mounts the switch plate isolated, no ground path needed.