Trailer light or electrical failure

What this may mean

• 7-way cord damage
• Ground issues
• Lighting module / ABS faults

Should you keep driving?

Do not run dark on public roads — fix or escort per local law and fleet policy.

Information to gather

• Which lights out
• Tractor vs trailer power
• Recent hookup

Provider type to find

Mobile electrical / trailer repair

FAQ

Is this a tractor or trailer problem?

Test with another known-good cord or tractor when possible. Tell the tech what you already swapped.