Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
Can you check to see if you have a blown indicator fuse in the interior fuse panel?
Sounds like your trailer wiring may have a problem.
Do you need any further help?
I hope my advice has been of assistance to you.
I somehow doubt that.
All lighting circuits have a fuse for that circuit to protect the rest of the vehicle.
I will opt out and open the question to another tech.