B3886

Trailer Right Tail Lamp Circuit

Severity

⚠️ Medium

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$22–111 (est.)

Symptoms

The right side marker light of the trailer does not work.
Flashing or unstable operation of the right side of the trailer
Warning on the dashboard about the malfunction of the lights

Causes

Broken wires in the trailer right side light circuit
Corrosion of contacts in the flashlight connector
Malfunction of the side light itself
Trailer wiring harness problems
Malfunction of the control unit responsible for the trailer lights

How to Fix

Check the serviceability of the right side marker light of the trailer
Inspect the wiring harness and connectors for damage and corrosion.
Test the circuit with a multimeter
Replace damaged wires or connectors
Check the operation of the chain after repair

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