Trailer Lights flashing

[Dwhowl]

When I turn on right turn signal both tail lights on our Casita flash, tested on another trailer and did same, so I think it’s on my Silverado truck wire, this just started, hasn’t been happening before. Do I need to remove truck plug to detect problem?

[Wayne Collins]

What are the truck light doing?

[mchalewj]

If all the tail lights, marker, and clearance lights are flashing together, it may be a bad ground to your Silverado.

[Dwhowl]

Both trailers I plugged into do the same thing when I turn on right turn signal all lights flash, and occasionally when no lights on truck are on, signal light light is on.

[Alex Adams]

You could determine if the fault is with the Tow Vehicle's wiring or the trailer's wiring with one of these:

https://www.amazon.com/gp/product/B0...d-b31d6b1bfbee

If the same thing happens with the lights on this, then it is the Tow Vehicle's wiring. If it doesn't it is the trailer's wiring.