Yes, you read that title right. My turn signals and emergency flashers only work with the engine off and I can't find out why. A little backstory: I recently (2 weekends ago) converted over to the Edelbrock Pro Flo 4 with a Holley Sniper EFI fuel tank. Before this install the lights worked perfectly with no issues. After the install I noticed my turn signals weren't working on the first test drive. So when I got home I unplugged the turn signal flasher and plugged it back in and it worked...

Turn signals and e-flashers ONLY work with engine off