Center brake light not working

[Dave Talz]

I have a 2023 TrailManor 2518. The top center light on the back of the camper does not light when the brake lights come on. The running light works in the center light. And the brake lights work in the left and right turn signal lights. This light was working in the past. We only noticed this problem on a recent trip.

The center light is an Optronics, Fusion LED light, model STL264. Using the Optronics website for wiring information, I unscrewed the light to get to the wires and I checked the electric current coming to the light with a voltage meter. There is no current coming to the light for the brake light. The voltage meter shows 12 volts for the running lights when they are on. Since the turn signal brake lights work when braking, and the center running light works, I assume that the wiring is OK from the tow vehicle to the back shell.

The center light is hardwired and there is only about 1 inch of extra wire. The 4 wires go from the light unit into the Styrofoam insulation of the top shell. I cannot determine how the center light wiring joins the wiring in the shell.

Is there a way to get to the wiring for the lights in the shell? Any ideas on how to fix this problem?