The Stovebolt Site Forums The Shop Area The Electrical Bay Headlights stop turn lights from blinking

I finished wiring the 49 GMC pickup. Tried the turn signals. They work fine unless I turn on the park lamps or head lights. Then the turn lights come on but don't blink. All the lights seem to be wired to the correct side and everything.
Is this a grounding problem or is the flasher getting power from the wrong source?
Or what? ? ?