I’m trying to replace the incandescent tail/brake/turn lights on my kayak trailer. All the lights work fine, I’m just tired of the occasional loose bulb. The Optronics lights that came with the trailer are a 2-wire set (see photo) and grounded through the harness, the ground wire is attached to the trailer tongue.
The new LED lights have a ground wire (see photo). When the ground wire is attached to the trailer frame, I have tail lights but no brake lights or turn signal. If that ground wire is removed, I get nothing. If I reattach the old 2-wire light, it works fine.
I'm assuming there are mixed grounding systems now with the new light. What are my options? Completely rewire the trailer if I want to enjoy the LED lights?
Original 2-wire light:
New 3-wire light: