[70gp]

Well, I ran across another hurdle over the past couple days and am posting this as an FYI to the next guy that would decide to add these cornering lights to their GP J. I made an assumption (yes, I know the saying about assume) that the '69 and '70 Grand Prix SJ's used the same headlamp harness with the cornering lamp terminals on them. I bought a used harness from a '69 SJ to use on my '70 J and when I looked closer at the harness plug that goes into the bulkhead, I noticed that one of the terminals in the plug was missing from the location it was supposed to be according to my '70 Pontiac Service Manual. Terminals used for the cornering lamp option on the '70 are in location BS & DS. The plug on the '69 harness did not even have a tab at location BS. I found a 1969 Pontiac Service Manual pdf online and found that the cornering lamp terminals were in location CT & CU on the '69 harness. A quick continuity check confirmed this, so the '69 harness is a no go. All the other connections in the plug are in a different location too. The seller was nice enough to take it back and I can get a new harness from Ames or M&H, so it's just a bump in the road. But I just am posting this to possibly save someone else the grief if they do a search on this subject.