New 69 wiring problems

[soonerfanru2]

Hello new to the forum and just bought a 69 short wide has a 5.3 out of a 04 chevy 4l60 e transmission it runs and drives real good. The problem is they installed a painless wiring system in the truck and I don't know if they got everything right. It needed new turn signal harness he had it but never installed told me that's why stuff wasn't working right so I installed it and this is what I got.

When I turn left signal on I get front left and both rear blinking and left light in dash.

When I turn right signal on I get right rear and both front blinking and both in the dash.

Also headlights on dim right light only.

On bright left only.

Tell me it's just a grounding problem I hope.