LED Third Brake light

[Drew63]

I have a 2012 Approach 745SE and the Led third brake light is permanently staying on, even when the ignition is switched off. The bottom two brake lights are fine.
Any one had this issue or know where to start looking to solve the problem.
Can you point me in the direction of where the connectors are located in the cab area. I have unplugged the connector behind the rear bumper and then the wires go into the main loom along the underside of the chassis towards the cab area and I cant follow these.

thanks

 

[Northernraider]

If its only the third light staying on then id suggest a fault in the earth wire for that light .. unusual though as it will almost certainly be wired in to one of the other brake lights ...just a simple live and negative. If you remove the rear light clusters you will most likely see the wires piggy backed on to the unit.