No Park lights (help)

Here's what I would do for what it's worth.......

Connect everything and pull the switch to the first contact. Connect your test light to the negative post of the battery and confirm that it works. Head straight to the light that is not on and remove the bulb. Probe the positive contact with your test light. If it lights up, you have a grounding issue. If it doesn't light up, work your way back up the wiring harness until you find power. That will help isolate where your issue may be.