Windshield wiper switch wiring

[pablosanchez69]

My 1967 RS/SS Camaro has a grey wire on the wiper switch to ground it. It has a large copper ring terminal on it that slides over the threads before installing the switch into the dash.
Is this original, or did someone add it?
If it is original, where does it connect to to ground the switch? Mine is loose under the dash.
I would think a star washer would ground the switch to the dash and do the job, but I want to leave it original. I cannot find this wire on my wiring diagram.
Thanks for the help.
Paul Low

[Pex68]

Paul,

Going off memory here but on my 68 (which should be the same set-up for 67) the wiper switch does have a large star type washer that goes on the switch before it goes through the dash and provides ground.  67's may be different though, may want to check the assembly manual.