68 mustang

[bears4ever]

I have a 68 mustang coupe. I'm doing a complete rebuild. Here's my problem. I have the new rebuilt motor trans and rear end in. All lights are in. Dash bezel is in. Cig lighter hooked up.The car is now painted. All wiring harnesses are in the car runs awsome. The problem is when I turn on my headlights on the front head lights and marker lights come on. The left rear back-up light comes on and the lights on the rear are a little dim. When I turn the signals on (left or right) the proper order happens but very dim and slow.(front is good) Its seems as if I have a grounding problem but where? I have ran some wire from the rear llicence plate light and the ground eye connector to the bat-ground. I have tried grounding my light switch but same problem. Could there be a short somewhere also. Please help getting a little frustrated now. Thanks

Regards

Steve