u/Cretin138

I'm battling a trailer wiring issue and I'm trying to diagnose. Everything is pointing to bad ground, I'm just stumped after trying a few things.

Trailer symptoms:

• Lights work
• blinker and breaks do not.
• same symptoms before and after rewiring.

What I've done:

• Used multi-meter at vehicle plug
  • 14v for lights and blinkers
• Rewired trailer
  • New wiring harness installed
  • New lights installed(incandescent ). The kind with no ground wire, push in connectors for the wires.
  • Ran separate ground to each light.
    • Lights do not have dedicated ground wire so I used a ring connector and attached to the bolt on light.
    • Both wires connect to a Wago connector near front of trailer then connected to main ground wire at plug.

I'm stumped because I have the same symptoms before and after rewiring. I figured if I have 14v from the plug all should be good from the vehicle side. What can I test next to narrow this issue down?