Technical Ignition switch question

I have a switch I want to use in my 47 Olds project from an OT Chevy. It has all the usual terminals on the back plus a couple I have no idea what they do. The ones in question are marked Key+ and Key-. I've tried hooking up my meter to see what they do, but can't get anything no matter how I hook it up! Don't really think I need those 2 terminals, but would like to know what they are for. Any help appreciated.

 

Have you checked with your ohm setting the continuity between Key- and GRD? And between BATT and Key+? In both off and on positions of the key? Also between Key+ and Key- with the ignition on?
That's a late 60's GM ignition switch, as earlier '65 and older had just 5 terminals. The 7 terminal version was first offered in 1966. Diagrams for that year simply call those terminals "Ignition #! and Ignition #2"

 

Yes I have, that's what has me baffled. It doesn't seem to matter how I hook up my meter

 

In that case, shouldn't I be able to determine the path of electricity using my meter? Nothing in the switch seems to connect to those terminals!

 

Possibly set up for a key with a resistor in it?

 

Head light doors?

 

I took that reply down. Only GND terminal does what I described. Sorry

 

Too early for a chipped key I would think. It's for a 68 Chevy, don't think they had them then?

 

Maybe, but still can't follow the path of electricity

 

Well there ya go! What the hell is a key buzzer though?

 

Tells you that you left your keys in the ignition when you open the door.

 

My '57 has the Ignition #1 and Ignition #2 wires having to do w the coil connection/resistor

 

So what you'll find is continuity between the two 'key' terminals when the key is inserted, they go open when it's out.
I also suspect that if you check the 'ground' terminal to the switch case, you'll have continuity between them when the switch is off and no continuity when the switch is turned to any other position. That would shut the buzzer off when the key is in use.

 

The ground terminal only make contact when key is turned fully to start position to illuminate idiot light/lights as a test bulb function only. Especially important for temp purposes.

 

That's a possibility also, although I suspect it's to check the new-for-67 brake warning light.

 

The GRD terminal goes several years back earlier than 67.

 

Tried all that and still got nothing. This is a brand new AC Delco switch, not aftermarket. I know that doesn't always guarantee it is good, but was hoping! At least all the other terminals work as they are supposed to. And yes, the ground terminal works when switch is turned all the way to start position. Don't plan on using lights though, just gauges.