[henry's 31]

Today I installed a new wiring harness on my 31 Roadster pickup that I purchased without any lights connected. My headlights are working, horn and breaklights also work perfectly. But I can't get my taillights to come on when I turn my parking or headlights and it appears only one of the many LED bulbs come on when I turn the lights on. My guess is a ground problem but how can I correct this. Any suggestions out there?


I thank you in advance for any suggestions.