1965 Pontiac Lemans/GTO Wiring Harness - gtoforum Nov 25, 20171965 Pontiac Lemans/GTO Wiring Harness. Hello, looking at recommendations for replacing the original wiring in my 1965 Pontiac GTO. I looked at Painless and didn't see a Pontiac specific harness, but I'm sure they have one that will work. I also looked at Kwik Wire, American Autowire, Street Rod Electrics and M&H.Author: Taylor CPontiac GTO Forum - View Single PostMay 27, 201966 GTO needs a new electric wiring harness, what`s theOct 23, 2018Wiring Harness for 1967 GTO ConvertibleJan 26, 2016See more results 1965 pontiac gto wiring harness | eBay Find great deals on eBay for 1965 pontiac gto wiring harness. Shop with confidence.