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Check your ground wire from the trailer to the vehicle.
Check the fuse to the trailer relay power supply.
Make sure the relay to the trailer lights hasn't died.
Many new vehicles require a relay for the trailer lights
as the voltage needed is too great for the wiring installed in the vehicle.
Had mine go on my truck a few months ago. Had to replace.
RK, this is probably the handiest tool for 12volt testing.
http://www.acehardware.com/product/index.jsp?productId=1378714&cp=2568443.2568455.2629358.1258951
Cheap and effective. Tells you right away if the socket is getting juice,
if the pigtail is getting juice, if the relay is doing it's job.
Clamp to a ground on the vehicle and probe for the problem.
If the mini-lite goes on ya got juice, if it don't ya' know right away.
Check the fuse to the trailer relay power supply.
Make sure the relay to the trailer lights hasn't died.
Many new vehicles require a relay for the trailer lights
as the voltage needed is too great for the wiring installed in the vehicle.
Had mine go on my truck a few months ago. Had to replace.
RK, this is probably the handiest tool for 12volt testing.
http://www.acehardware.com/product/index.jsp?productId=1378714&cp=2568443.2568455.2629358.1258951
Cheap and effective. Tells you right away if the socket is getting juice,
if the pigtail is getting juice, if the relay is doing it's job.
Clamp to a ground on the vehicle and probe for the problem.
If the mini-lite goes on ya got juice, if it don't ya' know right away.