Hi folks, I bought a 64.5 Mustang, 289 4sp, off a guy from ebay, and the only real issue is that the parking lights (front turn signals and tail lights) are on whenever the battery is connected. The previous owner installed a complete new wiring harness, new dash switches (lights, wiper, etc), turn signal, and ignition switch. He also replace many other mechanical things. I've heard that the light issue is likely from something somewhere not being grounded. Any ideas on where to start on this mystery?

Thanks!
Greg