Do you have a service manual for a wiring diagram? 

 

This is the entire wiring diagram, for the 66 Pontiac from the shop manual. Should help you with your problem. I do have a fairly complete wiring harness for a 2dr hardtop with column shift. It is not prefect as one of the contacts at the dash plug was burnt.

Hope that this will be of some help.

Luppy

. . Thanks for the diagrams. . They were a big help. .

. . Now I have another problem. . Seems finding parts for this thing is a bit of a trick. . Some Pontiac, some Chevy, some '65, some '66 and some that I don't think exist anywhere else in the world except in my car. .

. . Bought a '66 Pontiac wiring harness and it does not match anything in my car. . Found that my speedometer is the same as in the '65 Pontiac so I bought a '65 wiring harness. . It matched my speedometer and had an 8 terminal ignition switch plug but nothing else matched. . Chopped the 8 terminal plug off of that one and with your diagram wired it to my original harness. . Then I found out the original owner had used a later style ignition switch with different terminals than my 8 terminal plug. . Finally found an 8 terminal switch from a '65 Grand Prix. . Now the later style ignition lock cylinder won't fit that so I found one for a '65 Pontiac. . Well that one and every other one I can find are not deep enough. . Seems this "Grand Prix" switch is slightly recessed and needs a lock cylinder about a 1/4" deeper than anything else that exists in the world. .  Can you hear me starting to loose it. . 

                                                                                                                                                             

. . Yup, in Colorado. . This is my second Parisienne. . The first was a '68 Parisienne convertible but the '66 has always been my dream car so I sold the '68 when I found this '66. . Both came from B.C. . .
. . Yes the American '66 full size Pontiacs have the individual wires but the '65 had the printed circuit. . Neither had the rest of the Canadian version wires. .
. . I like the Canadian Pontiacs because of their differences to the American versions. . Maybe you know, , I understand that back then Pontiacs were built in both countries because of import tariffs but no one has been able to tell me why they chose to cross a Pontiac body with an Impala drive train. .

Has nobody stepped up yet to help with a dash harness? If not, I can try to find the contact info for Kevin Jackson who is close to Winnipeg. He had a Grande Parisienne. It had a console but that harness is not tied in much with the dash harness other than the neutral safety switch which is simple re-do and a power wire for the console light.

Oh, gotcha. I didn't catch that in your post.

You have a cylinder on the way?

Excellent, keep us posted please.

I parted out a 66 Grand Prix a couple of years ago and it had the ignition switch lying on the floor when I got it. It never occurred to me to check if they were the same. At a glance they looked it but clearly they aren't. I'd love to have the two side by side to see the difference. It seems crazy that GM would do that.