What should you verify about the trailer's electrical connection (the 'pigtail' or connector) during your inspection?

Pick an answer

1. That it is disconnected before every trip for safety
2. Only that the connector color matches the tractor's
3. Nothing, since trailer lights are tested only once a year at the annual inspection
4. That it is securely connected and the trailer's lights function correctly when tested

Correct!

Not quite. The correct answer is highlighted.